Police have renewed an appeal for witnesses to a major fire at a North-East factory.

The fire, at the Woo One factory, in Hartlepool, last month, is thought to have been started deliberately and is being treated as suspicious.

Korean owned Woo One, which supplies Samsung with plastic computer casings, has now closed but hopes to resume trading later this year.

It has been subject to allegations that it employed illegal immigrants from China.

Police have been combing CCTV footage after a security guard reported seeing someone on the premises before the fire started.

They have also spoken to workers at the plant as part of their investigation.

The fire caused severe damage to part of the roof which will have to be replaced.

DS Matt Mason, of Hartlepool police, said: "We are making inquiries and are looking at forensic and video evidence."

"We are also still appealing for witnesses."

Anyone who can help the inquiry should call (01642) 302126.