A 59-year old woman was killed and dozens were injured on Wednesday afternoon in Jerusalem after a bomb exploded near a bus stop.

It was the first terrorist attack in four years that involved an explosion, police said, according to the Jerusalem Post. Police were looking for a person who left a bag containing the bomb.

The explosive device detonated at a telephone booth just outside the Jerusalem Conference Center in the middle of the city. Reports said between 39 and 50 people were injured.

Windows of a bus at the scene were shattered, according to photos of the scene.

There was no previous information about the explosion, at top official told Ynet News

The Jerusalem District police are always ready for these types of events, but there was no specific warning, said Internal Security Minister Yitzhak Aharonovitch.

Jerusalem Mayor Nir Barkat said one of the wounded called police to inform about a suspicious package near the site of the blast, and then the explosion took place, according to the report.

He called the incident a cowardly terrorist attack and said he believed in the police's ability to catch the person responsible.