Police will question the management of the ASTV Manager newspaper today about the gun attack on four of the company's cars early on Saturday.

Metropolitan Police Bureau chief Pol Lt Gen Kamronwit Thoopkrachang had directed officers to solve the case quickly, Pol Col Jakkrapob Sukhontharat, chief of the Chana Songkhram police station, said yesterday.

Pol Col Jakkrapob said he will call in the ASTV management for an interview today.

He said investigators have not yet determined what provoked the shooting, although they believe it was intended as a warning rather than an attempt to hurt anyone.

Police yesterday checked footage from CCTV cameras at the newspaper's office and from nearby areas to identify the gunman, Pol Col Jakkrapob said.

A man in a black shirt was filmed walking on the footpath opposite the ASTV headquarters at 3.25am on Saturday. At 3.26am, the footage showed footage of a car with a shot-out mirror, and at 3.28am, it showed the same man walking toward nearby Soi Kai Jae.

Police had spoken to five witnesses, Pol Col Jakkrapob said.

A gunman fired a shot at each of the four cars parked in front of the ASTV office near Santi Chaiprakan Park on Phra Athit Road.

No one was hurt in the shooting.

A mirror on the second floor of the Anurak building, which houses the company's administrative offices, was also damaged.

Pol Lt Gen Kamronwit said he did not think the shooting had anything to do with the recent spat between the newspaper and army chief Gen Prayuth Chan-ocha.

The newspaper had criticised Gen Prayuth for his perceived failure to stand up for the country's interests in its territorial dispute with Cambodia. It also criticised his strategy in the deep South.

Gen Prayuth responded by calling ASTV Manager a "lousy newspaper".

The newspaper in turn then likened the general to a "woman on her period".

Soldiers rallied in front of the newspaper office on Jan 11 and 12 to oppose the paper's criticism of the army chief.

Gen Prayuth, however, ordered them to back off and apologised to the public.

Army deputy spokesman Col Winthai Suwaree said the army had nothing to do with the shooting. The dispute between the army chief and the newspaper was laid to rest after Gen Prayuth ordered soldiers to stop their protest, he said.

"The army is not an opponent of anyone and any efforts to link the army to the shooting are unwarranted," he said.