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A portion of Highway 126 in Fillmore was closed Thursday because of a sinkhole, and authorities said it would remain closed indefinitely.
Eastbound traffic was diverted at A Street. The sinkhole was east of A Street near Central Avenue.
A mobile camera was sent into the hole to determine its depth and what caused it, said Fillmore Fire Chief Rigo Landeros.
The closure caused a significant traffic backup on the eastbound side of the highway heading into the city, Landeros said. He advised motorists to avoid the area if possible.
The hole was only a pothole a few days ago. It has grown to about 3 feet in diameter but is wider underground, officials said.
Caltrans was working on closing the hole and put up detour signs in the area, said Ventura County sheriff's Capt. Rob Davidson.
Authorities said it would easily be closed until Friday if not longer.