( AP ) - Several people were arrested in Denmark on suspicion of preparing an act of terror involving explosives, the Danish intelligence service said Tuesday.
The suspects, who were not identified, were arrested late Monday in the Copenhagen area, the intelligence service, known as PET, said in a brief statement.
The men had been under surveillance, the agency said.
The TV2 news channel said police had cordoned off a street in Noerrebro, an immigrant district of Copenhagen. Helicopter footage showed a police bomb squad and forensics agents in the area, but it was not immediately clear if the operation was related to the terror arrests.
Danish radio said police had also searched an apartment in Ishoej, a southern Copenhagen suburb with a large immigrant population.
Police declined to comment on those operations.
It was the third time Danish police cracked down on suspected terrorist networks since 2005.
The trial of four men suspected of planning to blow up a target in Denmark or Europe was set to begin in Copenhagen on Wednesday.
In February, a court sentenced Abdul Basit Abu Lifa, a Danish citizen of Palestinian descent, to seven years in prison for his involvement in a Bosnia-linked plot to blow up a target in Europe. Three other defendants were acquitted in that case, although one of them is awaiting a retrial.
Terrorists have not hit Denmark in more than two decades, but the July 2005 bombings in London stirred fears that the Scandinavian country could be targeted for its participation in the U.S.-led coalition in Iraq.
In June, Denmark pulled out its 460-member army contingent and replaced it with a small air force squad.