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Defiant Egyptian protesters clash with police near Tahrir Square

Khalil Hamra / AP

A protester throws stones during clashes with riot police near Tahrir Square in Cairo, Egypt, on Nov. 22.

Khalil Hamra / AP

A protester runs to throw a tear gas canister away during clashes near Tahrir Square on Nov. 22.

msnbc.com news services report from CAIRO:

Egyptians converged on Cairo's central Tahrir Square on Tuesday in response to a call for a so-called "million-man march" as protests against the country's military rulers entered a fourth day.

Thousands of Egyptian protesters have been camping out on the square and clashing with police trying to force them to leave. Continue reading.

See more images of the unrest in Egypt in our slideshow.