The U.S. Coast Guard says it intercepted a submarine-like vessel carrying 7 tons of cocaine off Central America's coast.

The Coast Guard says a U.S. Navy aircraft spotted the 60-foot vessel Wednesday about 400 miles south of the Mexico-Guatemala border.

The Coast Guard sank the vessel after determining it was too unstable to be towed to port.

The Coast Guard's statement Friday did not say if anyone was arrested. Officials didn't immediately return calls seeking comment.

The bust came four days after the U.S. Coast Guard and Navy seized another homemade submarine carrying 7 tons of cocaine. That craft was towed to a Coast Rican port and four Colombians on board were arrested.