diff --git a/src/ausf/ausf-sm.c b/src/ausf/ausf-sm.c
index 439ba6c4c..db60a23fc 100644
--- a/src/ausf/ausf-sm.c
+++ b/src/ausf/ausf-sm.c
@@ -133,6 +133,7 @@ void ausf_state_operational(ogs_fsm_t *s, ausf_event_t *e)
                     }
                 }
                 break;
+            CASE(OGS_SBI_HTTP_METHOD_DELETE)
             CASE(OGS_SBI_HTTP_METHOD_PUT)
                 if (message.h.resource.component[1]) {
                     ausf_ue = ausf_ue_find_by_ctx_id(
diff --git a/src/ausf/nausf-handler.c b/src/ausf/nausf-handler.c
index f591a3977..21ee58982 100644
--- a/src/ausf/nausf-handler.c
+++ b/src/ausf/nausf-handler.c
@@ -112,3 +112,19 @@ bool ausf_nausf_auth_handle_authenticate_confirmation(ausf_ue_t *ausf_ue,
 
     return true;
 }
+
+bool ausf_nausf_auth_handle_authenticate_delete(ausf_ue_t *ausf_ue,
+        ogs_sbi_stream_t *stream, ogs_sbi_message_t *recvmsg)
+{
+    ogs_assert(ausf_ue);
+    ogs_assert(stream);
+    ogs_assert(recvmsg);
+
+    ogs_assert(true ==
+        ausf_sbi_discover_and_send(
+            OGS_SBI_SERVICE_TYPE_NUDM_UEAU, NULL,
+            ausf_nudm_ueau_build_auth_removal_ind,
+            ausf_ue, stream, NULL));
+
+    return true;
+}
diff --git a/src/ausf/nausf-handler.h b/src/ausf/nausf-handler.h
index 6349e94a6..38dc4603c 100644
--- a/src/ausf/nausf-handler.h
+++ b/src/ausf/nausf-handler.h
@@ -30,6 +30,8 @@ bool ausf_nausf_auth_handle_authenticate(ausf_ue_t *ausf_ue,
         ogs_sbi_stream_t *stream, ogs_sbi_message_t *recvmsg);
 bool ausf_nausf_auth_handle_authenticate_confirmation(ausf_ue_t *ausf_ue,
         ogs_sbi_stream_t *stream, ogs_sbi_message_t *recvmsg);
+bool ausf_nausf_auth_handle_authenticate_delete(ausf_ue_t *ausf_ue,
+        ogs_sbi_stream_t *stream, ogs_sbi_message_t *recvmsg);
 
 #ifdef __cplusplus
 }
diff --git a/src/ausf/nudm-build.c b/src/ausf/nudm-build.c
index 0af3cfd7c..4d5b1f529 100644
--- a/src/ausf/nudm-build.c
+++ b/src/ausf/nudm-build.c
@@ -117,3 +117,56 @@ end:
 
     return request;
 }
+
+ogs_sbi_request_t *ausf_nudm_ueau_build_auth_removal_ind(
+        ausf_ue_t *ausf_ue, void *data)
+{
+    ogs_sbi_message_t message;
+    ogs_sbi_request_t *request = NULL;
+
+    OpenAPI_auth_event_t *AuthEvent = NULL;
+
+    ogs_assert(ausf_ue);
+
+    memset(&message, 0, sizeof(message));
+    message.h.method = (char *)OGS_SBI_HTTP_METHOD_PUT;
+    message.h.service.name = (char *)OGS_SBI_SERVICE_NAME_NUDM_UEAU;
+    message.h.api.version = (char *)OGS_SBI_API_V1;
+    message.h.resource.component[0] = ausf_ue->supi;
+    message.h.resource.component[1] = (char *)OGS_SBI_RESOURCE_NAME_AUTH_EVENTS;
+
+    AuthEvent = ogs_calloc(1, sizeof(*AuthEvent));
+    if (!AuthEvent) {
+        ogs_error("No AuthEvent");
+        goto end;
+    }
+
+    AuthEvent->time_stamp = ogs_sbi_localtime_string(ogs_time_now());
+    if (!AuthEvent->time_stamp) {
+        ogs_error("No time_stamp");
+        goto end;
+    }
+
+    AuthEvent->nf_instance_id = NF_INSTANCE_ID(ogs_sbi_self()->nf_instance);
+    AuthEvent->success = true;
+    AuthEvent->auth_type = ausf_ue->auth_type;
+    AuthEvent->serving_network_name = ausf_ue->serving_network_name;
+
+    AuthEvent->is_auth_removal_ind = true;
+    AuthEvent->auth_removal_ind = true;
+
+    message.AuthEvent = AuthEvent;
+
+    request = ogs_sbi_build_request(&message);
+    ogs_expect(request);
+
+end:
+
+    if (AuthEvent) {
+        if (AuthEvent->time_stamp)
+            ogs_free(AuthEvent->time_stamp);
+        ogs_free(AuthEvent);
+    }
+
+    return request;
+}
diff --git a/src/ausf/nudm-build.h b/src/ausf/nudm-build.h
index 70bed018c..f9e489e86 100644
--- a/src/ausf/nudm-build.h
+++ b/src/ausf/nudm-build.h
@@ -29,6 +29,8 @@ extern "C" {
 ogs_sbi_request_t *ausf_nudm_ueau_build_get(ausf_ue_t *ausf_ue, void *data);
 ogs_sbi_request_t *ausf_nudm_ueau_build_result_confirmation_inform(
         ausf_ue_t *ausf_ue, void *data);
+ogs_sbi_request_t *ausf_nudm_ueau_build_auth_removal_ind(
+        ausf_ue_t *ausf_ue, void *data);
 
 #ifdef __cplusplus
 }
diff --git a/src/ausf/nudm-handler.c b/src/ausf/nudm-handler.c
index 8657cd674..4e17a9dc9 100644
--- a/src/ausf/nudm-handler.c
+++ b/src/ausf/nudm-handler.c
@@ -214,6 +214,25 @@ bool ausf_nudm_ueau_handle_get(ausf_ue_t *ausf_ue,
     return true;
 }
 
+bool ausf_nudm_ueau_handle_auth_removal_ind(ausf_ue_t *ausf_ue,
+        ogs_sbi_stream_t *stream, ogs_sbi_message_t *recvmsg)
+{
+    ogs_sbi_message_t sendmsg;
+    ogs_sbi_response_t *response = NULL;
+
+    ogs_assert(ausf_ue);
+    ogs_assert(stream);
+
+    ausf_ue_remove(ausf_ue);
+
+    memset(&sendmsg, 0, sizeof(sendmsg));
+    response = ogs_sbi_build_response(&sendmsg, OGS_SBI_HTTP_STATUS_NO_CONTENT);
+    ogs_assert(response);
+    ogs_assert(true == ogs_sbi_server_send_response(stream, response));
+
+    return true;
+}
+
 bool ausf_nudm_ueau_handle_result_confirmation_inform(ausf_ue_t *ausf_ue,
         ogs_sbi_stream_t *stream, ogs_sbi_message_t *recvmsg)
 {
diff --git a/src/ausf/nudm-handler.h b/src/ausf/nudm-handler.h
index ee42f3aab..33c2fa325 100644
--- a/src/ausf/nudm-handler.h
+++ b/src/ausf/nudm-handler.h
@@ -30,6 +30,8 @@ bool ausf_nudm_ueau_handle_get(ausf_ue_t *ausf_ue,
         ogs_sbi_stream_t *stream, ogs_sbi_message_t *recvmsg);
 bool ausf_nudm_ueau_handle_result_confirmation_inform(ausf_ue_t *ausf_ue,
         ogs_sbi_stream_t *stream, ogs_sbi_message_t *recvmsg);
+bool ausf_nudm_ueau_handle_auth_removal_ind(ausf_ue_t *ausf_ue,
+        ogs_sbi_stream_t *stream, ogs_sbi_message_t *recvmsg);
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/ausf/ue-sm.c b/src/ausf/ue-sm.c
index 7be6bdcec..b78bde22e 100644
--- a/src/ausf/ue-sm.c
+++ b/src/ausf/ue-sm.c
@@ -98,6 +98,15 @@ void ausf_ue_state_operational(ogs_fsm_t *s, ausf_event_t *e)
                 OGS_FSM_TRAN(s, ausf_ue_state_exception);
             }
             break;
+        CASE(OGS_SBI_HTTP_METHOD_DELETE)
+            handled = ausf_nausf_auth_handle_authenticate_delete(
+                    ausf_ue, stream, message);
+            if (!handled) {
+                ogs_error("[%s] Cannot handle SBI message",
+                        ausf_ue->suci);
+                OGS_FSM_TRAN(s, ausf_ue_state_exception);
+            }
+            break;
         DEFAULT
             ogs_error("[%s] Invalid HTTP method [%s]",
                     ausf_ue->suci, message->h.method);
@@ -136,20 +145,37 @@ void ausf_ue_state_operational(ogs_fsm_t *s, ausf_event_t *e)
                 break;
             }
 
-            SWITCH(message->h.resource.component[1])
-            CASE(OGS_SBI_RESOURCE_NAME_SECURITY_INFORMATION)
-                ausf_nudm_ueau_handle_get(ausf_ue, stream, message);
-                break;
+            SWITCH(message->h.method)
+            CASE(OGS_SBI_HTTP_METHOD_PUT)
+                SWITCH(message->h.resource.component[1])
+                CASE(OGS_SBI_RESOURCE_NAME_AUTH_EVENTS)
+                    ausf_nudm_ueau_handle_auth_removal_ind(
+                            ausf_ue, stream, message);
+                    break;
 
-            CASE(OGS_SBI_RESOURCE_NAME_AUTH_EVENTS)
-                ausf_nudm_ueau_handle_result_confirmation_inform(
-                        ausf_ue, stream, message);
+                DEFAULT
+                    ogs_error("[%s] Invalid HTTP method [%s]",
+                            ausf_ue->suci, message->h.method);
+                    ogs_assert_if_reached();
+                END
                 break;
-
             DEFAULT
-                ogs_error("[%s] Invalid HTTP method [%s]",
-                        ausf_ue->suci, message->h.method);
-                ogs_assert_if_reached();
+                SWITCH(message->h.resource.component[1])
+                CASE(OGS_SBI_RESOURCE_NAME_SECURITY_INFORMATION)
+                    ausf_nudm_ueau_handle_get(ausf_ue, stream, message);
+                    break;
+
+                CASE(OGS_SBI_RESOURCE_NAME_AUTH_EVENTS)
+                    ausf_nudm_ueau_handle_result_confirmation_inform(
+                            ausf_ue, stream, message);
+                    break;
+
+                DEFAULT
+                    ogs_error("[%s] Invalid HTTP method [%s]",
+                            ausf_ue->suci, message->h.method);
+                    ogs_assert_if_reached();
+                END
+                break;
             END
             break;