STOCKHOLM (Reuters) - A gang of masked, black-clad men rampaged through the streets of Stockholm on Friday night handing out leaflets threatening to attack migrant street youths, "to make a statement", with police saying on Saturday two arrests had been made.

The incident highlights the growing tensions over immigration in Sweden, a country of 10 million which received 163,000 asylum seekers last year, and comes days after a 22-year old female worker was stabbed to death in a centre for unaccompanied asylum-seeking minors in southwestern Sweden.