Copenhagen  - Danish prosecutors Monday presented their case in a trial against two men arrested in terrorist raids last year, accused among other things of bomb-making.

The men, aged 22 and 21, were suspected of "preparing one or several bombs for use in a terror act" and for making the explosive triacetone triperoxide (TATP), the prosecution said.

The men were arrested in September 2007 in Copenhagen. During the proceedings Monday, it emerged that the Danish security intelligence service (PET) had kept them under surveillance for several months.

The PET had been tipped off that the older suspect had visited an alleged al-Qaeda camp in Pakistan and installed a secret camera in his flat, according to reporters at the court.

Police also seized a hand-written manual that bomb experts said described how to make explosives.

The men have denied trying to make bombs but said they were trying to make fireworks.

The two were likely to take the stand at the end of the week.

They were arrested with six other suspects in Copenhagen in September when the PET raided several locations in and around the capital. The other six were later released. (dpa)