Police have interviewed a suspect for the arson attack on the Lyttelton Police Station on Tuesday morning.

Lyttelton-based Sergeant Gary Manch said yesterday the enquiry was progressing and CCTV footage was still being reviewed.

The attack at the police station resulted in a police car being seriously damaged and another suffering heat damage.

The Fire Service was called to the station at 2.10 am after a neighbour reported hearing an explosion and seeing flames at the station.

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"We're fortunate that the damage wasn't more severe but it was still a blow," he said.

Sergeant Manch said police were waiting for forensic results.