A Southern California freeway was shut down and nearby homes were under evacuation orders Friday as a chemical reaction inside a railroad tank car threatened to cause an explosion, authorities said.

A section of a major Southern California freeway was shut down and 170 homes were under evacuation orders Friday as a chemical reaction inside a railroad tank car threatened to cause an explosion ...

Authorities are continuing to urge the public to avoid the area near Harvill and Oleander avenues , where on Thursday the railroad tank car carrying styrene, a highly volatile liquid typically ...

The investigation will focus on the time it took for a tank car full of styrene to travel ... According to initial reports from the Central Railroad of Indiana, the stabilizer in the tanker ...