WASHINGTON, Sept 9 (Reuters) - The Federal Aviation

Administration on Tuesday issued a safety alert to airlines over

risks from lithium batteries in aircraft passenger compartments,

citing a large number of serious incidents.

The FAA recommended airlines adopt risk mitigation

strategies including clear messaging to address potential fire

risks tied to lithium batteries carried by passengers and crew

members and review firefighting procedures and training.

There have been 50 U.S.-reported lithium ion battery smoke,

fire or extreme heat incidents reported this year, the FAA said.