UPDATE: Oil rig in Gulf of Mexico explodes near BP rig

UPDATE:  Officials this morning are trying to figure out what caused another explosion in the Gulf of Mexico. An oil platform burst into flames Thursday off the coast of Louisiana. The Coast Guard says so far there are no signs of a spill -- all 13 crew members on board were rescued.

GRAND ISLE, LA -Another offshore oil rig in the Gulf of mexico has exploded.

This explosion is west of the site of the April blast that caused the massive oil spill.

Seven helicopters, two airplanes and four boats are en route to the cite, along the central Louisiana coast.

It hasn't been determined whether the structure is a production platform or a drilling rig, or whether workers were on the rig.

Smoke was reported, but it is unclear whether the rig is still burning.