Blast hits tax agency offices in Copenhagen - police

 A large blast hit the Danish Tax Agency's office in Copenhagen late on Tuesday, although the cause of the explosion was unclear, police said on Twitter.

The explosion caused a halt to trains in an area called Nordhavn, just north of the city centre. 

Two people were inside the tax agency's building but both are unharmed, police told Danish media. 

No group has claimed responsibility for the attack.