Six people, who were returning from an offshore drilling rig, aboard a Bristow helicopter have died, the company confirmed Aug. 13.

The aircraft, a Sikorsky S-76C+, that was involved in the accident in Lagos, Nigeria, on Aug. 12 carried 10 passengers and a crew of two. There are six survivors and six fatalities, Bristow said in a news release.

The Bristow flight crew was among the fatalities. They include Captain Joseph “Jay” Wyatt of Oklahoma and First Officer Peter Bello, of Nigeria. Wyatt joined Bristow in 2006 and spent his entire career flying with Bristow Helicopters out of Africa, the company said. First Officer Peter Bello joined Bristow in 2014 after graduating from Bristow Academy’s helicopter flight school. Both were experienced and qualified.

“We are shaken and deeply saddened by this tragic accident,” said Bristow’s Regional Director Africa, Duncan Moore. “Our thoughts and prayers go out to the families, friends and loved ones of all those on board.”

Bristow said it has mobilized the full resources of its response team and is working with authorities on the investigation, including at the accident site to recover the aircraft. Medical treatment is being provided to those who are injured, and trained coordinators have been assigned to the families of the crew members and passengers for support.

The company has established a hotline for family members of those on board the flight. Relatives may call +1 (855) 979-7533 or +1 (567) 302-7004 for information, care and assistance.