AWS Lambda major outage: suspending traffic to US-EAST-1 (status.aws.amazon.com)

Our lambda services are entirely down, no lambdas appear in the lambda console:

    null (Service: AWSLambdaInternal; Status Code: 503; Error Code: null; Request ID: null)

Requests to API gateway return 502: Internal Server Error

Successful invocations for us are on the up after being effectively down for 5 hours. Control plane very laggy, and I have a CloudFormation stack with a lambda backed custom resource that still won't delete.

Initially we were seeing "service unavailable" and "internal server errors". A while(couple hours?) later the API was returning a rather lengthy message about there being no capacity in the region.

I submitted this issues twice; shortly after the start of the outage and 2 hours later. Both were flagged out; aws must be running damage control here.