A grenade was tossed into a crowded minibus , local media reports say . 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 . Comment:
A grenade was tossed into a crowded minibus , local media reports say . No group has claimed responsibility for this attack . Comment: