The Danish prime minister has pledged to tighten controls at the Swedish border after two bomb blasts in Copenhagen this week.
Two Swedish men have been charged over the attacks.
Prime Minister Mette Frederiksen said she wanted to protect Denmark in a “better and smarter way”. Frederiksen added she had spoken to Swedish Prime Minister Stefan Lofven about increasing border control.
Sweden and Denmark are connected by the Oresund Bridge over a 16 km strait.
Both countries are in the European Union and the Schengen passport-free travel area.
Two explosions hit Copenhagen last week, one at a police station on Saturday and one outside the national tax agency three days earlier.
One person was injured.
One of the suspects, who is aged 22, was arrested in the Swedish city of Malmö, just over the border from Denmark. An international arrest warrant has been issued for the other man, a 23-year-old.