Danish police have arrested a man suspected of making a spate of bomb hoaxes that forced the evacuation of two provincial airports and two malls on Monday, the IB Times UK reported.

The suspect was held in Slagelse, a town about 100km west of Copenhagen, police said in a statement. "The man is suspected of sending a number of threats to Danish airports, shopping centres and hospitals," it said.

No information has been released as to how the yet unnamed man sent the hoaxes. While no motive was explained, the 28-year-old man is already known to the police, and is reported to have mental health problems according to Sydsvenskan.

Two shopping centres in the Danish towns of Roskilde and Slagelse were evacuated following a bomb scare, although police reported no immediate signs of an explosion, the report said.

Police closed Copenhagen Airport and Roskilde Airport, about 35km (22 miles) from the capital as precautionary measure. According to Danmarks Radio, all air traffic to and from the latter airport was stopped, while Copenhagen Airport was evacuated.

"There have been a number of bomb threats in a short period over the whole country," Danish police said on Twitter.

The Copenhagen Business School was briefly evacuated but allowed students back after checks, according to the newspaper Ekstra Bladet.