Several bombings and shootings around Copenhagen this year prompted Danish authorities to tighten border controls on the country's crossings with Sweden.
Over the weekend, Danish police carried out inspections of trains and vehicles crossing the Oresund Bridge over the narrow waterway that separates Copenhagen, the largest city in Denmark, and Malmo, the third largest in Sweden.
Police spokesman Jens Jespersen told the Associated Press that officers at the bridge checkpoint are "particularly focused on cross-border crime involving explosives, weapons and drugs. ".
"This gives us a pretty good picture of who is coming to us"
The new border control, along with the passport requirement for Swedes moving to Denmark, follows approximately a dozen Copenhagen explosions since February, and firing in June, which killed two Swedish citizens.
Violence is believed to be gang-related, stemming from drug, money, protection and revenge disputes. About 200 people in Malmo belong to about a dozen gangs.
SWEDISH POLICE ARIST 3 IN BOMBING MIDDLE INCREASE IN BORDER VIOLENCE
A shooting in Malmo on Saturday killed a 15-year-old boy and critical wounds. Police said the shootings of the teens were known to authorities in Malmo, and officials vowed to further combat organized crime. No arrests have been made yet.
Click here to get the application of FOX NEWS
The Associated Press contributed to this report.