PHOTO GALLERY: Ongoing clashes between protesters, Egypt security

before advancing on protesters near US embassy

back by round of tear gas near Tahrir Square

during a lull in the fighting

displays spent tear gas and bird-shot canisters used by riot police

tear gas to disperse protesters

spent tear gas canister manufactured in the US

clashes near the US embassy

administrative building, where visitors were met with heavy clouds of tear gas

All photos by Bassem Abo Alabass