Hundreds of activists of Left parties and other mass organisations across Telangana were arrested on Wednesday to foil their march to the state assembly to protest killing of two Maoists by police. Terming it as a "fake encounter", 370 organisations, including 10 left parties and the groups which fought for separate Telangana state, have come together under the banner of TDF to condemn the killings. It is demanding probe by a sitting judge.