One grenade in the southeastern town of Mtwapa killed one person and injured 31 others, said Nelly Mulluka, a spokeswoman for the Kenya Red Cross.
A second grenade hurled into a stadium in the coastal city of Mombasa injured two others, she said.
The attacks occurred in communities along the Indian Ocean, southeast of the Nairobi capital.
The East African nation has been on edge since it sent its troops into Somalia to pursue Al-Shabaab militants after the abductions of tourists and aid workers in Kenya. It blames the abductions on Al-Shabaab, which has denied involvement. Read More