Nairobi, Kenya (CNN) -- A grenade explosion killed seven people and wounded another 24 on Sunday in a predominantly Somali neighborhood of Nairobi, a Kenya Red Cross official said. The grenade was tossed onto a minibus, known as a matatu, full of passengers riding through the Eastleigh section, according to local media reports. No group has claimed responsibility for this attack. Such attacks have escalated since Kenyan forces invaded neighboring Somalia last year to battle the Islamist militant group Al-Shabaab, blaming it for kidnappings of foreigners in the nation. A grenade thrown into a Kenyan church two weeks ago turned a prayer service into carnage, killing one worshipper and wounding 13 others.A grenade was tossed into a crowded minibus, local media reports sayNo group has claimed responsibility for this attackAttacks like this have escalated since Kenyan forces invaded neighboring Somalia last year
_ forces are engaged in a fight in SomalIa to debilitate Al-Shabaab. Kenyan forces are engaged in a fight in _ to debilitate Al-Shabaab.