No 'direct link' with foreign terror groups

US President Barack Obama was yesterday set to visit Orlando to meet with survivors of the massacre at a gay nightclub and relatives of the 49 people killed, as a top intelligence official confirmed that no direct link had been found between the shooter and foreign terror groups.

Omar Mateen, 29, a US citizen born in New York to Afghan immigrants, also wounded 53 people in a three-hour rampage inspired by Islamic State militants that stands as the deadliest mass shooting in modern US history.

CIA Director John Brennan told a Senate Intelligence Committee hearing that the agency "not been able to uncover any direct link" between Mateen, who was shot dead by police, and foreign terror groups.

Mateen claimed allegiance to a variety of militant Islamist groups, including some at odds with each another, in a series of phone calls to 911 emergency services and a local cable television news channel during his rampage.

The Federal Bureau of Investigation has interviewed Mateen's second wife, Noor Salman, who knew of his plans, according to a law enforcement source, and prosecutors were preparing to present evidence against her to a federal grand jury.

Salman has not commented publicly since the attack, which began around 2 am Sunday.

"We're working with our law enforcement partners to find out everything that we can about what happened at the Pulse nightclub," Lee Bentley, the US Attorney for Florida's middle district said on Wednesday. "We are using all law enforcement and legal tools to reconstruct not only the events of that night but the events of the past several months."

Obama, accompanied by Vice President Joe Biden, was to travel to Orlando in the latest in a long list of trips he has taken to console victims of mass shootings during his 7-1/2 years in office. In December 2015, a married couple inspired by Islamic State shot dead 14 people in San Bernardino, California.

"This will be, I think, an emotional trip," White House spokesman Josh Earnest told reporters. "The president recognizes that he is a symbol for the rest of the country. But it would be impossible for him not to be personally affected by these kinds of conversations."

The mass shooting renewed debate in Washington about gun control. Some Republicans including presumptive presidential nominee Donald Trump and US Senator Pat Toomey, a Republican from Pennsylvania, suggested that people on federal watch lists who are banned from flying on commercial jets should not be allowed to purchase firearms.