What We Know: Gay nightclub shooting deadliest on US soil

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The shooting began around 2:00 a.m. local time (0600 GMT) inside the nightclub and there once was a confrontation between the suspect and an officer working at the club outside the venue, according to local police.

ISIS has since claimed responsibility for the attack, according to the Amaq News Agency, ISIS's official news arm.

However, his father, Seddique Mateen, an Afghan-descent American with political ambitions, told a TV news station that the shootings had nothing to do with religion.

Mateen, who carried an assault rifle and a pistol into the gay club in Orlando in the wee hours of Sunday and killed 50 people while injuring 53 others, was later shot dead by the police.

"He beat me", she told the newspaper.

Mateen lived in Florida, but was born in NY, to Afghani immigrants.

Law enforcement identified the gunman, who died in a shootout with police, as Omar Mateen, 29. "(Omar Mateen's) father loves this country". He says the Federal Bureau of Investigation (FBI) is treating the situation as an act of terrorism. G4S said in a statement that Mateen had been employed by the company since September 10, 2007.

Three US officials familiar with the investigation into the massacre said that no evidence had yet been found showing a direct link with Islamic State or any other militant group. Police said they do not have a second suspect they are actively looking for, and do not know of any "credible or singular threats that are facing the Orlando area or nationally". "The FBI is appropriately investigating this as an act of terror".

In addition to Monday's planned vigil and an offer to provide aid, Boston Mayor Marty Walsh extended another token of tribute for the victims of the mass shooting Sunday at a gay nightclub in Orlando.

The massacre is considered to be the worst mass shooting in USA history.

The couple were together for only four months because he was abusive, she said in remarks televised from Boulder, Colorado, and the two had no contact for the last seven or eight years.

The United States has failed to come up with a response that actually targets the cause of terrorist attacks perpetuated by radicalized lone wolves, said Federalist publisher Ben Domenech on CBS's "Face The Nation" today. Although the Food and Drug Administration recently updated its guidelines to allow men who have not had sex with another man within a year's time to donate blood, Michaels said OneBlood's system hasn't been updated to allow that just yet, but it will happen later this year.



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