Police in Copenhagen say they have shot dead a man who opened fire on them close to the sites of two earlier attacks in the city.
They are investigating whether the man might be behind deadly shootings hours earlier at a cafe and near a synagogue.
In the first attack, one person was killed and two injured during a free speech debate in a cafe.
In the second, a civilian was killed and two police officers wounded near the city's main synagogue.
It was not immediately clear how the shootings may have been connected.
Early on Sunday, police said they had shot dead a man near a railway station in the neighbourhood of Noerrebro where they had been keeping an address under observation.
Barrage of gunshots
The BBC's Malcolm Brabant reports from Copenhagen that the Danish capital has been abuzz with sirens and helicopters, amid fears that other attacks could be imminent.
Police have warned residents that it is not safe to be in the city centre. They launched a massive manhunt after the first shooting, which took place during a free speech debate attended by a Swedish cartoonist.
An audio recording, obtained exclusively by the BBC, revealed the moments leading up to the attack.