`` We did everything that we could do , '' Kenya 's foreign minister says . The United States has been trying to get the Kenyan government and opposition parties back on track since a disputed election in 2007. Al-Shabaab 's Mohamed Mohamud `` has a lot of grudges against the Kenyans , '' expert says .
`` We did everything that we could do , '' Kenya 's foreign minister says . Despite intelligence , rapid response team stuck in Nairobi for hours after massacre , official says . Al-Shabaab 's Mohamed Mohamud `` has a lot of grudges against the Kenyans , '' expert says .