ABC tightens security after intruder allegedly assaulted employee

A man allegedly snuck into the ABC's Sydney building and assaulted a female employee.

Police have charged Kieren Gallagher. Source: ABC via NSW Police

A man has been charged after he allegedly infiltrated the ABC's high-security Sydney headquarters and assaulted a female employee.

Kieren Gallagher, 31, entered the ABC's Ultimo offices last Wednesday afternoon, police said in a statement on Monday.

Mr Gallagher allegedly approached the female employee before grabbing and kissing her. He fled the scene moments after.

The ABC building in Sydney. Source: AAP

Police arrested Mr Gallagher on Monday and security has since been boosted at the national broadcaster.

An email circulated to ABC employees, seen by AAP, said Mr Gallagher is believed to have tailgated staff walking through the building's high-security doors.

Mr Gallagher appeared before Central Local Court on Monday charged with stalking and intimidation with intent to cause fear as well as trespassing and common assault.