Terrorist threats against Sweden have increased partly due to the Swedish contribution to the NATO-led International Security Assistance Force (ISAF) in Afghanistan, the head of the Swedish security service said Wednesday, according to DPA. "In the ongoing hiss that is always visible there were some traces or observations that indicated an interest for Sweden and Sweden's foreign and security policy," security service chief Klas Bergenstrand told Swedish radio. Bergenstrand said the assessment was based on intelligence collected by Swedish military intelligence and information from foreign agencies. A bomb blast last November killed two Swedish soldiers near the northern Afghan city of Mazar-e-Sharif. Parliament has approved plans to increase the Swedish contribution to ISAF in Afghanistan to a maximum of 375 during the coming two-year period, depending on developments in the country. The Swedish contingent is part of a British-led provincial reconstruction team. Some 12,000 NATO-led ISAF troops are currently providing security in Kabul and other Afghan provinces.