A major counter terror operation is underway with a series of raids being conducted across Sydney.
The NSW Joint Counter Terrorism Team raided properties at Surry Hills, Lakemba, Wiley Park and Punchbowl on Saturday afternoon.
"This activity relates to an ongoing investigation," a police spokesman said.
"The safety of the community and police members are the primary consideration during this activity."
Cleveland Street is closed in both directions in Surry Hills due to the police operation between Elizabeth and Crown streets, the Transport Management Centre said.
"Motorists are advised to avoid the area or allow plenty of extra travel time," a spokesman said.
The Seven Network reports 40 riots squad officers stormed a Surry Hills terrace before the explosives team found a suspicious device.
TV footage shows a man with a bandage on his head and draped in a blanket being led away by authorities.
Fairfax Media reports the raids were in relation to a terrorist cell "and a bomb plot involving aircraft".
