Later convinced to surrender.

A lone gunman holed up for several hours in a Colorado Springs Planned Parenthood clinic surrendered to police at around 4:50 p.m. local time on Friday, a police department spokeswoman announced.

Eleven victims were transported to local hospitals — five of them police officers at various agencies — Lt. Catherine Buckley said during a press briefing. She said that she was not sure if there were any fatalities.

The standoff began shortly before noon on Friday when police responded to a call coming from inside the Planned Parenthood clinic. The gunman, who has not yet been named and who was described as carrying a “long firearm,” reportedly began shooting at officers as they showed up to the scene.

The gunman’s motive is still unclear. It was initially reported that the shooting may have started at another business near the Planned Parenthood clinic, though authorities later said that the incident began at the clinic. Many have speculated that the gunman targeted the clinic because it performs abortions.

Buckley said that the suspect brought several items with him inside the building and that police and agents with the Bureau of Alcohol, Tobacco, Firearms and Explosives are treating them as possible explosives.

Buckley also said that while officers initially did not have verbal contact with the gunman, they were later able to shout at him and convince him to surrender.

The Denver Post published video of a man being led away from the scene of the shooting in handcuffs. The man appears to match descriptions given earlier in the day on police radio.