POLICE are hunting an arsonist or arsonists who set fire to an office on Monday night in the Tweed City Arcade in Wharf St, Tweed Heads.
It is believed a Molotov cocktail was thrown into the office of Kirkwood Construction, but police said yesterday that crime scene police from Lismore were yet to finish their investigation.
"We're still in the middle of the investigation," Detective Sen-Constable Owen Pringle said yesterday.
He confirmed that police were fairly certain of what began the fire but he would not comment on what that might be.
Police are seeking information from anyone who saw or heard anything which can help them solve the case.
Fire crews were called to the fire at just before 11pm on Monday night.
A security door on the lower level of the arcade on Beryl St was smashed and may have been where access was gained to the arcade.
Tweed River Station Commander Darryl Pearce said his crew, as well as the Tweed Heads station crew, left around midnight after bringing the fire under control.
The fire was not large and had caused "just a lot of smoke damage", Mr Pearce said.
Tweed Heads detectives were called in because the fire was considered suspicious.
They will prepare a report for the NSW Coroners' Office.
Kirkwood Constructions spokesman Keith Holland said staff hoped to be in the office today and start the job of cleaning up.
He said computer back-ups meant they could continue on and damaged equipment would be replaced.
"Probably the worst thing will be the smell," Mr Holland said.
Yesterday morning workers from all the offices on the top floor of the arcade were unable to get in until police had finished their investigation.
Some of these suites were also affected by smoke and water damage and none of the offices on the top floor had power as electrical wiring was burnt out.
Two workers from the Northern Rivers Area Consultative Committee next door to Kirkwood Constructions said they were hoping to get access to their offices around lunch time but would work from laptops in the meantime.
Det. sen-const. Pringle said the fire was not believed to be linked to a fire at the old von Bibra buildings just a few doors down from the arcade.
Fire units were called to that fire at 9.45pm on Sunday night. The premises are vacant and damage was not substantial.
A fire spokesman said there did not appear to be any obvious links between the two fires and that it was very unusual to get two structural fires in such a short period of time.