Five anti-military protesters have been arrested after breaking into a Swedish Air Force base to demonstrate against joint exercises planned with the US Air Force.

The protesters tried to break into F21 Squadron’s base near Luleå. A total of 30 members of the anti-military organization Ofog were present during the demonstration. Ofog claims that seven of them entered the aerodrome’s restricted area.

“The military took care of them, then they were handed over to the police,” said Ofog activist Karin Carlsson.

Police say that five activists were involved.

“It will be up to prosecutors and the courts whether to proceed,” said Hans Österlund of Norrbotten police.

The activists are suspected of breaking laws governing access to restricted areas, police say.

Planes from the USAF are spending two weeks in Luleå to practice bombing, together with Swedish Air Force counterparts.

"The USA is the world's biggest and most aggressive fighting country in the world... When Sweden allows the US Air Force to come here and train, we make ourselves accessories to the USA's war crimes," activist Maja Backlund said in a statement on Ofog's website.