He said “goons” dressed in balaclavas lobbed grenades at the town’s Catholic church and the African Inland Church (AIC).
Kenya’s border region has been tense since it sent troops into Somalia to pursue al-Shabab Islamic militants.
Kenya said the operations, launched last October, were designed to bring an end to kidnappings on Kenyan soil and other violence which it blamed on al-Shabab.
UPDATE 2: The casualties include 6 women, two men and two police officers.
UPDATE 1: Death toll has reportedly risen to 10, and 50 injured.
No fewer than nine people were reportedly killed and about 3 were injured on Sunday morning in simultaneous grenade and gun attacks at the Garissa Catholic Church and AIC church.
Report says two grenades were thrown at the congregation at the Catholic Church but one exploded.
Police say the attacks occurred simultaneously as the congregations were in prayers and no arrests have been made so far.
At the AIC church, the attackers used a rifle to shoot at people randomly killing and injuring the victims inside the church.
“It is shocking because the bodies are lying in the church and so far we have no clue of where the attackers are,” said a senior officer in the area.
Details of the attack are still sketchy.