This post has been updated: 

The District Department of Transportation has reopened 14th Street Northwest in both directions between F and G streets

The road had been closed on Saturday while workers investigated what caused an entire lane to collapse.  

DDOT tweeted just before 10 a.m. Saturday that the southbound lanes of 14th Street were closing while officials investigated what caused the collapse. A little before 11 a.m., spokesman John Lisle said all lanes were being closed, and motorists were being urged to seek alternate routes. He said one lane of the roadway had sunk.

Lisle said workers could "hear water underneath, so they are guessing that it is most likely a leak or a break of some sort." D.C. Water tweeted that the incident was a suspected break, and customers could find information here: