ORLANDO, UNITED STATES (Reuters) - Panicked callers to 911 during June's mass shooting in Orlando told police of buildings hit by stray bullets and wounded friends stuck inside the gay nightclub where a gunman pledging allegiance to Islamic State killed 49 people.

Shooter Omar Mateen killed 49 people and wounded 53 at the Pulse nightclub in the deadliest mass shooting in modern US history.

On Aug 30, authorities in Florida made public for the first time recordings of what the police were told about the attack. This Reuters video packages the voice calls together with footage from the night of the shooting.

One neighbour near Pulse told 911 operators people were banging on his door to escape the shooting and others were seeking cover behind parked cars.

People reported on the carnage inside the club.

A woman told an operator her husband was in the club and he reported shooting.

Authorities did not release the names of those who called 911 or those who were mentioned as being inside the club.

Mateen, 29, was killed by police inside the nightclub.

He pledged allegiance to the leader of the Islamic State militant group during the rampage in which he used an assault rifle and pistol that had been legally purchased although he had twice been investigated by the FBI for possible connections with militant Islamist groups.

US authorities believe that Mateen, who lived in Fort Pierce, Florida, with his wife and young child, was self-radicalized and acted alone without assistance or orders from abroad.