LAGOS, Nigeria (AP) — A helicopter traveling from an oil rig crashed into the lagoon in Nigeria's commercial capital, Lagos, killing four people on Wednesday, according to aviation officials.

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

Dati said four people died and eight survived. Injured victims were taken to the hospital, according to the National Emergency Management Agency.

Bristow said in a statement that it was still working to identify those on board and the extent of any injuries. It said preliminary information indicated the chopper was carrying two crew and eight passengers. 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.

The helicopter, an American-made Sikorsky S-76C+, crashed on approach to Lagos' Murtala Muhammed International Airport, Bristow said.