Did a delay in police response give shooter more time?

Two bodies of victims arrive at the Orlando Medical Examiner's Office, Sunday, June 12, 2016, in Orlando, Fla. A gunman opened fire inside a crowded gay nightclub early Sunday, before dying in a gunfight with SWAT officers, police said. (AP Photo/Alan Diaz) (The Associated Press)

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A medical worker examines a body at the Orlando Medical Examiner's Office , Sunday, June 12, 2016, in Orlando, Fla. A gunman opened fire inside a crowded gay nightclub early Sunday, before dying in a gunfight with SWAT officers, police said. (AP Photo/Alan Diaz) (The Associated Press)

Orlando Police Chief John Mina describes the details of the fatal shootings at the Pulse Orlando nightclub during a media briefing Monday, June 13, 2016, in Orlando, Fla. (AP Photo/Chris O'Meara) (The Associated Press)

Experts are questioning why police held off for several hours before storming the Florida nightclub where a gunman shot more than 100 people.

Law-enforcement leaders say lessons learned from other mass shootings suggest it's vital that police confront an attacker rather than wait to assess the situation.

As the shooting began Sunday, an off-duty police officer working at the Orlando club exchanged gunfire with the suspect. But three hours passed before SWAT team members stormed the building and ended the attack.

Chris Grollnek is an expert on active-shooter tactics and a retired police officer and SWAT team member. He says "action beats inaction 100 percent of the time."

It's not clear yet what information authorities in Orlando had and how the decisions were made.