(CNN) -- Hundreds of protesters tried to make their way to the U.S. Consulate Sunday in Karachi, Pakistan, but were pushed back by police, a witness said.
Video on Pakistani TV showed protesters running from baton-wielding officers. Some demonstrators threw rocks at the officers; in some case, officers threw rocks back.
Some police fired shots in the air and used water cannons, according to Haider Ali, a witness at the scene.
Sharfuddin Memon, spokesman for Sindh Province, said the U.S. Consulate was not attacked and that the building was not damaged. He also said protesters numbered in the hundreds.
There were several clashes between police and protesters, leaving some demonstrators injured, Memon said.
Rian Harris, spokeswoman for the U.S. Embassy in Pakistan, said the consulate staff in Karachi is safe and that the building was not attacked.
The consulate is taking proper safety measures, she said