WOODBURY, MN - Two Wisconsin women escape unharmed after a mattress, stuck under their SUV, ignited and caused the vehicle to burst into flames on an interstate in the Twin Cities area.

Kathleen Rich, from the Milwaukee area, was visiting her daughter in Richfield Sunday.

She says she didn't see the mattress dropped on Interstate 494 until it was too late to avoid it.

Rich says she hit the mattress, but thought she left it behind until other drivers motioned for her to pull over.

Rich and Rogers took shelter in another car and watched as the SUV burst into flames.

John Wallgren from the Woodbury Fire Department tells Newswatch 12 the fire may have been caused by heat from the SUV's catalytic converter.