U.S. President Joe Biden on Wednesday pledged aid to Jackson, Mississippi, as the majority-Black state capital endured its third day without drinking water after a long-troubled water treatment plant failed.

The promise from Washington came as frustrated people in Jackson waited in long lines amid sweltering heat at distribution sites where volunteers handed out cases of bottled water.

Complications from recent floodwaters knocked the O.B. Curtis water treatment plant offline on Monday night, with little reliable estimate of when service will be restored. Water pressure remained low or nonexistent, with some pipes carrying water that had not been fully treated.