Flash floods hit cities and towns south of Boston Thursday as historic rain brought traffic to a crawl and shut down part of I-93.

A "considerable" flash flood warning has been issued in Boston as heavy, life-threatening rain pounds the city and areas to the south.

The heavy rain caused parts of a major highway to be shut down on Thursday. The state’s emergency management agency warned drivers to stay off of flooded roads, where vehicles can be swept away in less than two feet of moving water.