Several explosions and shots in the Copenhagen area this year have led the Danish authorities to tighten border controls at Sweden's border crossings.
At the weekend, the Danish police controlled trains and vehicles crossing the Öresund Bridge across the narrow waterway between Copenhagen, Denmark's largest city, and Malmö, Sweden's third-largest city.
Police spokesman Jens Jespersen told The Associated Press that officers at the Bridge Vehicle Checkpoint had "a particular focus on cross-border explosives, weapons and drugs crime".
"It gives us a pretty good picture of who passes by," he said.
The new border controls, along with a passport requirement for Swedes entering Denmark, have followed about a dozen explosions in Copenhagen since February. and a shootout in June in which two Swedish citizens were killed.
It is believed that the violence is related to gangs due to disputes with drugs, money, protection and retribution. About 200 people in Malmö have about a dozen gangs.
SWEDISH POLICE AT THE INCREASE OF VIOLENCE AT THE BOMB
In Malmö on Saturday a 15-year-old boy was critically killed by shots another wounded. The police said teenagers who were shot were known to the authorities in Malmö, and officials pledged to further combat organized crime. There have been no arrests.
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The Associated Press has contributed to this report.