COSTA MESA, Calif.—A blocked pipe at the Costa Mesa (55) Freeway at Baker Street might have human remains in it, officials said Oct. 18 as efforts were underway to clear the pipe.

Caltrans and California Highway Patrol (CHP) officials became aware of the blockage Monday and requested that coroner’s officials be on hand when the pipe was flushed Tuesday, according to  Sgt. Scott Steinle of the Orange County Sheriff’s Department.

Work on clearing the obstruction began at 8 a.m. Tuesday, Steinle said. Until the blockage is cleared authorities will not be certain whether it is human remains, he added.

A Caltrans crew inspecting a culvert with a robotic camera spotted what appeared to be a skeleton at about 9:30 a.m., according to CHP Officer Anselmo Templado.

The coroner and a Caltrans supervisor came up with a plan to extricate the remains by flushing the pipe with water, but they ran into a problem with debris stuck in the pipe, Templado said. A vacuum was being used to suck out the debris, Templado said.

Access to the pipe is about 26 inches wide so it’s possible that a person could have climbed in, but the pipe narrows.

Templado said there was no evidence so far of any foul play.