Coast Guard chopper crashes in Ala.; 3 missing

An MH-65 Dolphin U.S. Coast Guard helicopter is seen during a training exercise in a Sept. 2011 file photo.

Updated 12:35 a.m. ET

MOBILE, Ala. - The U.S. Coast Guard says three people are missing and one person has been rescued after one of its helicopters crashed in Mobile Bay during a training mission.

Spokeswoman Petty Officer 2nd Class Elizabeth Bordelon says an MH-65 Dolphin helicopter crashed Tuesday evening near Point Clear, Ala. She says the rescued person has been taken to the hospital but she did not immediately know the person's condition.

Bordelon says the helicopter was on a mission out of the Aviation Training Center in Mobile, Ala. She says she did not immediately know if the four people on board the helicopter were Coast Guard service members.

She says the Coast Guard has two helicopters and a boat conducting the search.

The area has been placed under a dense fog warning, reports CBS affiliate WKRG-TV. Although the fog has yet to arrive, it could end up hampering rescue efforts.