FORT LAUDERDALE, Fla. -- Police in Fort Lauderdale are investigating a series of attacks that left one homeless man dead. One of the beatings was caught on tape.

Warning: Contains graphic images, video
Images: Surveillance Video Shows Attack
Related Article: City In Florida Named America's 'Meanest For Homeless'

The men were beaten at three locations early Thursday morning -- the Florida Atlantic University campus at Los Olas, Church by the Sea at 17th Street and the Broward Center for the Performing Arts.

Police said the men were beaten by two to four white men armed with bats or sticks.

Surveillance video from FAU showed one of the attacks. In the video, two white men are seen beating the homeless man with what appear to be bats.

Despite his injuries, the man was able to contact campus security, who called Fort Lauderdale police at about 1 a.m. The man is listed in serious condition at Broward General Hospital.

At 2 a.m., police received another call in the 400 block of Southwest Second Street near Riverwalk. Norris Gaynor, 45, died from his injuries at Broward General Medical Center, police said.

"It is a terrible thing that happened and they will be punished accordingly," police Detective Kathy Collins said. She said Gaynor's death will bring homicide charges against the attackers.

A third victim was attacked while he was sleeping in a parking lot at Church by the Sea. That man is in serious condition.

"We cannot say for certain that these are related, however there are a lot of similarities," Collins said. "The victims were homeless. The suspects were two to four white males and the nature of the crime, that they were beatings. We are linking them and we're trying to gather information right now."

Ten years ago, Sean Cononie founded The Homeless Voice, an advocacy group that also provides shelter for the homeless. On Thursday, Cononie hit the streets to give out fliers to alert the homeless community about the beatings.

"I could never answer why somebody commits a hate crime, especially when they give you an answer 'for fun,'" Cononie said. "They've been decapitated before. They've been lit on fire. They've been pushed in rivers as they sleep and drowned."

Police are asking for the public's help in finding the attackers.

"We're following up on all the leads that we get. We have received some leads already, some tips from the public. We would like the public to continue calling us with any information they have. If they think that they may recognize someone but they're not sure, call us anyway," Collins said.

If you recognize the men in the video, call Crime Stoppers at (954) 493-TIPS.

Meanwhile, advocates were encouraging homeless people in South Florida to stay in shelters.

According to the National Coalition for the Homeless, 25 homeless people in the U.S. were killed in attacks in 2004.