At least one person was killed and 10 were wounded Monday in a grenade attack at a bus stop in central Nairobi, the second such incident in less than a day, police said. The earlier attack saw 14 people wounded after a grenade was lobbed into a a bar overnight, with police suspecting Shebab operatives for what they feared could be part of the group's retaliation for Kenya's week-old incursion in Somalia.