By Xinhua,
Washington : Seven people were killed and three injured seriously in a mid-air collision between two helicopters in the US state of Arizona, the Federal Aviation Administration (FAA) said.
All three people on one of the choppers were killed, while four of the seven people onboard the other helicopter lost their lives and the rest injured seriously in the collision, the FAA said in a statement.
The identities of the victims are not yet released.
An investigation into the cause of the collision has been ordered.
This is the second plane crash in the US Sunday.
Another single-engine small plane crashed outside of Las Vegas, Nevada, in the early afternoon, killing all four people on board.
SUPPORT TWOCIRCLES
HELP SUPPORT INDEPENDENT AND NON-PROFIT MEDIA. DONATE HERE