A 15-by-15-foot sinkhole has developed on Third Street in front of John W. North High School in Riverside Wednesday night, officials said.

UPDATE: Third Street to remain closed ‘well into’ Thursday

City crews had been working in the area earlier in the day trying to find a leak, when they noticed the street start to buckle, said Phil Pitchford, a city spokesman.

The road was closed between 6 and 7 p.m., police said.

Pitchford said crews will be working thoughout the night to find and repair the leak, then fix the 4-foot-deep hole in the road.

According to the Riverside Public Utilities’s Facebook page: “Preliminary information is that a 10-inch water main is leaking. (The Riverside Police Department) has shut down the street and crews are performing emergency repairs.”

Pitchford said he expects the road will be closed through the morning.

This story is developing. Check back for updates.