A 40-year-old activist has been indicted on arson charges after burning an Israeli flag during a protest at Columbia University in April. James Carlson, who is unaffiliated with the Ivy League school in Morningside Heights, took the flag after someone else had stolen it from a Jewish person at the April 20 protest, according to the Manhattan District Attorney’s office. He then set it on fire with a lighter, the office said in a statement.