(Reuters) - Students in about 30 schools were told to shelter in place after a possible incident at Exxon Mobil Corp's <XOM.N> Torrance, California, refinery on Wednesday, a report on the CBC Los Angeles news website said.
A separate report with ktla.com said residents reported hearing an explosion from the direction of the refinery and that the refinery was working to control a petroleum leak.
In a filing with state pollution regulator, the 149,500 barrel-per-day Torrance refinery reported "an incident" that caused flaring at the refinery.
The company was not immediately available for comment.
(Reporting by Arpan Varghese in Bengaluru)