According to the Guardian:

More than 500,000 Iranians are silently marching from from Haft-e-Tir Square to Vali Asr Square, reports Saeed Kamali Dehghan in Tehran. Many are wearing black in mourning for those killed in earlier protests. Protesters want to go to Tehran University later to mourn the killing on Sunday of students in a dormitory. Reuters says that "tens of thousands" of people are protesting. One street leading to the square was packed for several kilometres, witnesses said. Most of the protesters were silent and making victory signs. Some are holding pictures of those killed.The authorities say the rally is banned.

A Human Rights organization says that at least 32 are now confirmed dead.

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