Shells fired from a mortar-like mechanism near a municipal government building in Istanbul slightly injured three people, the city's governor reportedly said. Unknown assailants fired the shells from a cemetery near the building that houses the Uskudar district's Parks Department, and one of them hit a truck parked outside the building, private Dogan news agency cited Gov. Muammer Guler as saying. Others fell short and exploded in the cemetery. The assailants used a simple mechanism that worked like a mortar to catapult the shells, Guler reportedly said. Earlier, the private TV stations CNN-Turk and NTV said the intended target was a military barracks nearby but the shells did not travel far enough. But Guler said the real target of the attack was not clear, Dogan reported.