Federal grand jury could charge wife of Orlando shooter -source
* Gunman's wife could be charged as soon as Wednesday
* Obama calls U.S.-born killer "angry, disturbed, unstable"
* University in Orlando holds vigil
By Letitia Stein and Julia Edwards
ORLANDO, Fla./WASHINGTON, June 15 (Reuters) - A federal grand jury has been convened to look into possible wrongdoing by the wife of the gunman who killed 49 people at an Orlando gay nightclub, and criminal charges could be brought against her early as Wednesday, a law enforcement source said.
Omar Mateen's wife, Noor Salman, knew of his plans for what became the deadliest mass shooting in modern U.S. history, said the law enforcement source who has been briefed on the matter.
"It appears she had some knowledge of what was going on," said U.S. Senator Angus King, a member of the Senate Intelligence Committee, which received a briefing on the attack.
"She definitely is, I guess you would say, a person of interest right now and appears to be cooperating and can provide us with some important information," King told CNN.
Salman was with Mateen when he cased out possible targets for an attack in the past two months, including the Disney World resort in April, then a shopping complex called Disney Springs and the Pulse nightclub in early June, CNN and NBC reported. Continuación...