The federal Bureau of Alcohol, Tobacco Firearms and Explosives has taken over the investigation to find the grenade.

The US military killed a senior ISIS leader in a raid in Syria on Friday, as well as two of his ISIS-affiliated sons, according to a release from US Central Command.

The military gave few details on the ground operation, but counterterrorism raids have typically involved helicopter-borne Special Operations commandos.

Thailand has launched airstrikes against Cambodian military targets along their disputed border, in an escalation of their deadly border dispute. Follow for live updates

Thailand’s military fired artillery toward Cambodia as tensions further escalate between the two countries over a century-old border dispute. At least 16 people have been killed in the armed clashes as both sides blame each other for starting the conflict.