diff --git a/synapse/rest/client/report_event.py b/synapse/rest/client/report_event.py
new file mode 100644
index 0000000000..07ea39a8a3
--- /dev/null
+++ b/synapse/rest/client/report_event.py
@@ -0,0 +1,68 @@
+# Copyright 2016 OpenMarket Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import logging
+from http import HTTPStatus
+
+from synapse.api.errors import Codes, SynapseError
+from synapse.http.servlet import RestServlet, parse_json_object_from_request
+
+from ._base import client_patterns
+
+logger = logging.getLogger(__name__)
+
+
+class ReportEventRestServlet(RestServlet):
+ PATTERNS = client_patterns("/rooms/(?P<room_id>[^/]*)/report/(?P<event_id>[^/]*)$")
+
+ def __init__(self, hs):
+ super().__init__()
+ self.hs = hs
+ self.auth = hs.get_auth()
+ self.clock = hs.get_clock()
+ self.store = hs.get_datastore()
+
+ async def on_POST(self, request, room_id, event_id):
+ requester = await self.auth.get_user_by_req(request)
+ user_id = requester.user.to_string()
+
+ body = parse_json_object_from_request(request)
+
+ if not isinstance(body.get("reason", ""), str):
+ raise SynapseError(
+ HTTPStatus.BAD_REQUEST,
+ "Param 'reason' must be a string",
+ Codes.BAD_JSON,
+ )
+ if not isinstance(body.get("score", 0), int):
+ raise SynapseError(
+ HTTPStatus.BAD_REQUEST,
+ "Param 'score' must be an integer",
+ Codes.BAD_JSON,
+ )
+
+ await self.store.add_event_report(
+ room_id=room_id,
+ event_id=event_id,
+ user_id=user_id,
+ reason=body.get("reason"),
+ content=body,
+ received_ts=self.clock.time_msec(),
+ )
+
+ return 200, {}
+
+
+def register_servlets(hs, http_server):
+ ReportEventRestServlet(hs).register(http_server)
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