A bus fell off a bridge on Sunday in Kenya and plunged into a river along the highway, killing at least 21 people, police said. The bus, traveling from the central town Meru along the highway to Nairobi, the capital, “must have developed brake failure, because it was at a very high speed when the accident happened”, said senior police official Rono Bunei. The accident occurred about 6:30pm and Red Cross officials said the rescue operation was suspended after nightfall. Alex Mugambi, the manager of a community rescue team, said he believes the death toll is likely to rise. The accident is the l…