Update 3:20 p.m.
The repairs to the water main are almost complete, according to DC Water’s Twitter. The street will remain closed and crews are going out to repair the damage tomorrow.

Original

A large sinkhole opened up on the 3500 block of 6th Street Southeast early Tuesday morning, closing the entire Congress Heights block until further notice.

The 3500 Block of 6th Street, SE is CLOSED until further notice due to a sinkhole that developed after a water main break. https://t.co/zfdcWlYY2R

— DDOT DC (@DDOTDC) September 25, 2018

The sinkhole was caused by a break in an 8-inch water main, according to the Washington Post. Officials said on Twitter that the water main will take eight to 10 hours to repair.

⚠️Team blue is currently onsite investigating this break on an 8” main on 6th St SE. Should be 8-10 hrs to restore, please use alternative route.⚠️ #dctraffic https://t.co/v1E1V0OEiz

— DC Water (@dcwater) September 25, 2018

Videos of the sinkhole on Twitter show parked cars in danger of falling in, and a Metrobus struggling to avoid driving into it. You can hear people gasping as the bus wobbles trying to back up.

Metrobus backed out of the damaged part of 6th St SE. Onlookers gasping as the bus bobs and weaves. Not sure whether watermain break caused the road to collapse or if it’s be other way around. pic.twitter.com/cBroAR4qBY

— Bob Barnard (@barnardfox5dc) September 25, 2018

Metrobus has said that buses to Anacostia will be detoured due to the sinkhole.

A2: Due to a sinkhole, buses to Anacostia detour at Mississippi Ave & 4th St SE to resume regular route at 4th St & Savannah St SE.

— Metrobus Info (@Metrobusinfo) September 25, 2018