- Summary- Raisi spoke after Biden said U.S. would 'free Iran'- Those who create insecurity 'must be dealt with' - Raisi- Sunni cleric says southeast protests treated 'mercilessly'DUBAI, Nov 5 (Reuters) - President Ebrahim Raisi said Iran's cities were "safe and sound" after what he called a failed attempt by the United States to repeat the 2011 Arab uprisings in the Islamic Republic, Iranian media reported on Saturday as protests continued for a 50th day.As Iranian authorities marked the anniversary this week of the seizure of the U.S. embassy in Tehran by radical students, President Joe Biden backed the protesters, saying: "We're gonna free Iran.Students in a dozen universities in Tehran and in Karaj, west of the capital, in the northern city of Rasht, and Mashhad in the northeast protested on Saturday, chanting slogans such as "Woman, Life, Freedom," according to videos posted by HRANA.Rights group Hengaw posted a video which it said was from Sanandaj, capital of Kurdistan province, with protesters starting fires to block a main street late on Saturday.The U.S. dollar was selling for 362,100 rials on the unofficial market on Saturday, after losing nearly 12% of its value since the protests started, according to foreign exchange website Bonbast.com."