Bosnian Serb police say they arrested five people as part of a Swedish police operation targeting arms smugglers and are still searching for two others.

Spokeswoman Mirna Miljanovic said Friday the arrests made a day earlier were part of a Swedish-run operation in which Swedish authorities have previously arrested one person.

During a raid in two northern Bosnian towns, Laktasi and Gradiska, police seized a significant amount of arms and ammunition and were still searching for the missing suspects.

Miljanovic would not say whether the weapons were meant to be used in terrorist acts in Sweden but did confirm the arrests were made by a police anti-terrorist unit.