A powerful blast struck a central area of the Hungarian capital Budapest late Saturday. Footage on social media shows a large police presence at the Oktogon intersection.
Witnesses have reported several casualties.
Two victims are reported to be police officers, and have been rushed to a hospital.
Hundreds of people appear to be out in the street as a massive police operation swings into action.
While the cause of the explosion is yet to be confirmed, witnesses say there are casualties.
According to locals there are a number of people being treated in the street near the Corninthia hotel.
There are some reports that the incident could be a gas explosion though authorities have not yet confirmed.
In videos emerging from the scene people appear to be being treated for injuries in the street however there does not appear to be damage to buildings.
Members of the public say they are being evacuated from restaurants as the emergency services continue their work at the scene.
Twitter user Ilona Vanouplines said: “I heard and felt a really loud #explosion in the city center of Budapest, a lot of police cars are passing by at Erzsébet krt.”