A tanning centre in the Østerbro district was bombed at 11 o'clock this morning causing extensive damage but no one was reported injured, reports DR public broadcaster.
Police do not suspect the explosion to be an act of terrorism.
The area around Nøjsomhedgade street, a side street to Østerbrogade street, where the centre was located is currently being evacuated due to a bag being left behind by two men suspected of detonating the bomb.
A police spokesperson said they were evacuating residents as a safety measure even though nothing indicated that there were more explosives in the bag.
The entrance of the tanning centre was destroyed leaving a gaping hole where the wall was.
Witnesses said that the entire building shook with the impact of the explosion.
They also saw burning objects fall from the sky and parts of the destroyed building were found 200 metres away on Østerbrogade street.
Two masked men were seen running away from the scene after the explosion.
Police are calling for witnesses, in the area at the time of the explosion, who may have seen the men.
According to a police statement, the suspects are both men of foreign backgrounds, one of them being tall and thin with shortly cropped dark hair between 15 and 20 years of age and the other being of sturdier build, wearing a dark-grey jumper and dark trousers between 20 and 25 years old.