Two persons were killed and another critically injured in a collision involving two motorbikes at Krishnapuram in Madhira mandal on Saturday. According to police sources, a motorbike collided with another bike coming in the opposite direction on the outskirts of Krishnapuram in the afternoon. S Umamaheshwara Rao, 30, of Bonakal mandal, was killed on the spot. Another person died while undergoing treatment at a hospital in Madhira an hour later.