Aviation officials say a helicopter traveling from an oil rig has crashed into the lagoon in Nigeria's commercial capital, Lagos, killing four people.

Spokesman Yakubu Dati of the Federal Airports Authority of Nigeria said the helicopter belongs to Bristow, a Houston, Texas-based firm that charters helicopters to oil and gas companies.

Dati said four people died and eight survived. The nationalities of those involved weren't immediately known.

The Nigerian Civil Aviation Authority said the helicopter was en route from an offshore oil rig when it crashed Wednesday afternoon near Third Mainland Bridge, between Victoria Island and the mainland.