TANZANIAN police have arrested Freeman Mbowe, the leader of the main opposition party Chadema, according to Tundu Lissu, the party's candidate in last week's presidential election. The opposition has demanded a repeat election, citing widespread irregularities, and called for protests against the outcome, which returned President John Magufuli to office with 84% of the vote. Those arrested with Mbowe include a former member of parliament Godbless Lema, the former mayor of Dar es Salaam, Isaya Mwita, and the former mayor of Ubungo municipality, Boniface Jacob. "I got a message around midnight that they had been taken in," Lissu told Reuters…