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ORLANDO, Fla. — The city of Orlando is publishing the names of those killed in a massacre at a gay nightclub on its website after their families have been contacted.

As of 3:45 p.m. Sunday, the list had four names. Fifty people were killed.

Shooter Omar Mateen was killed; his name is not on the list.

Fifty-three more were hospitalized.

The city’s website includes the #PrayforOrlando hashtag and says officials are “working tirelessly” to get information to families.

The list can be found at http://www.cityoforlando.net/blog/victims/

President Barack Obama says the worst mass shooting in U.S. history is a further reminder of how easy it is for someone to get a weapon that allows them to shoot people in a school, in a house of worship, a movie theater or a gay nightclub.

Speaking from the White House, Obama says the United States has to decide if that is the “country we want to be.” He says that doing nothing is a decision as well.