A man is assisting investigators after a security breach at a building in Sydney’s CBD triggered a large police response.

Police were called to the 21st floor of an office building on Elizabeth Street, Sydney, after a security breach at 12.15pm today.

A man was located following a search of a building and police are questioning him.

Patrol officers have been called to a building in Elizabeth Street in Sydney’s CBD. (Nine)
Several police cars and officers were seen outside the building. (Nine)

Police said they were dealing with alleged trespass offences.

They also said the man did not have a weapon.

“We didn’t have the information at the time, all we had at the time was a male on the 21st floor, a lot of the floors of this building are empty,” Inspector Wayne Ashworth said.

“We had a male at the building, (with) unusual behaviour.” 

The man was trying to sell an app to people inside the building, according to early enquiries by police. 

He is taken into custody and is assisting police with their enquiries.

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