( CNN ) -- Hundreds of protesters tried to make their way to the U.S. Consulate in the Pakistani city of Karachi on Sunday but were pushed back by police . Pakistani television 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 protesters numbered in the hundreds . There were several clashes between police and protesters , leaving some demonstrators injured , Memon said . Some protesters threw rocks and other objects that hit the consulate building , said Rian Harris , spokeswoman for the U.S. Embassy in Pakistan . Some walls may have been damaged , she said . The consulate took proper safety measures , Harris said . Zakaria : What Mideast protests reveal . Ex-Seals among Benghazi dead . Ambassador died 'trying to help build a better Libya ' CNN 's Reza Sayah in Islamabad contributed to this report .
NEW : Some rocks hit the consulate building , a U.S. Embassy spokeswoman says . Some police fired water cannons . The embassy is closed for now and will remain so until further notice. The consulate took safety measures .