Young Iranian men criticise racism against Afghans, with one of the signs declaring, "I am also an Afghan" (see 0610 GMT)
Aref, held on six occasions since the disputed 2009 Presidential election, was released in October 2011 after serving a year and receiving 74 lashes, but he was seized again in mid-March.
1805 GMT: Tough Talk of the Day. Masoud Jayazeri, the deputy head of the Joint Chiefs of Staff, has declared, "In the face of any attack, we will have a crushing response. In that case, we will not only act in the boundaries of the Middle East and the Persian Gulf, no place in America will be safe from our attacks."
Jayazeri added that Iran would not strike any country first.