ORLANDO, Fla. — Police dispatchers heard repeated gunfire, screaming and moaning from patrons of the Pulse nightclub who called to report that gunman Omar Mateen was opening fire inside the club, according to written logs released Tuesday.

The first call of “shots fired” came in at 2:02 a.m. and the caller reported “multiple people down.”

One caller said Mateen had gone upstairs where six people were hiding. Dispatchers heard up to 30 gunshots in the background at another point as callers screamed and moaned.

“My caller is no longer responding, just an open line with moaning,” one dispatcher said in the report.

Another dispatcher wrote, “Hearing gunshots closer, multiple people screaming.”

A caller described Mateen as wearing a gray shirt and brown pants.

Mateen opened fire at the club on June 12, leaving 49 patrons dead and 53 injured in the worst mass shooting in recent U.S. history. In calls with the police after the shooting began, Mateen pledged his allegiance to Abu Bakr al-Baghdadi, the leader of the Islamic State group, declared himself to be an Islamic soldier and demanded that the United States stop bombing Syria and Iraq, the FBI said.

“Saying he pledges to the Islamic State,” a dispatcher wrote at 2:40 a.m.

The report recounted where patrons hid in the nightclub: in an office upstairs, in a closet, in a dressing room and behind a stage. Ten people were hiding in the handicap stall of a bathroom. One caller described patrons using their hands to stop the bleeding of shooting victims.