CALIFORNIA -- The California Highway Patrol said today a mechanical problem is to blame for igniting a limousine fire that killed five nurses who were trapped in the back as they crossed the San Mateo-Hayward Bridge on May 4th.

CHP Captain Mike Maskarich says the blaze broke out because of a catastrophic failure of the rear suspension system. Authorities say no charges will be filed.

The fire broke out while a nurse, Neriza Fojas, was celebrating her recent wedding with a group of friends. She was among the five killed. Four other friends inside the limo and the limo driver survived.

The driver, 46-year-old Orville Brown of San Jose, said at first he misunderstood what the passengers in the back of the 1999 Lincoln Town Car was saying when they knocked on the partition window. He thought they were asking if they could smoke. They were actually yelling there was smoke in the limo.