Baird talks down tensions over terror laws

NSW Premier Mike Baird has played down talk of tensions between the state and federal governments over the development of tougher anti-terror laws.

Fairfax Media reports that six weeks before 15-year-old Farhad Jabar shot Curtis Cheng, Mr Baird wrote to then-prime minister Tony Abbott asking for the time a terror suspect could be held without charge to be increased, but didn't receive a response.

The premier wants police to be granted power to hold suspects in custody for up to 28 days without charge, and the minimum age for control orders lowered to 14.

Attorney-General George Brandis has raised concerns about constitutional issues with the proposed laws.

But Mr Baird said on Wednesday that both levels of government were "absolutely united on this".

"What we're doing is working on together what measure can we introduce," he said.