Kenyan security forces on Thursday killed five people suspected of involvement in massacres earlier this week in the country's coastal Lamu region, the interior ministry and a military source said.
In a statement released via Twitter, the ministry said there were five "suspected attackers shot dead while escaping", adding that three AK-47 assault rifles as well as ammunition were recovered at the scene.
A senior Lamu county official confirmed that the Kenyan army had been deployed in the area following Sunday night's massacre in Mpeketoni, in which around 50 people were killed, and the attack in a nearby village the following night, in which officials say nine people died.
"There was a heavy operation in the area of Bodahai in Lamu county. The government deployed soldiers in that area in the morning," he told AFP.
A military source said the five were killed by soldiers but that other suspected attackers escaped.
"Others escaped after an exchange of fire with our men, but five were killed," the senior military officer said. "They were armed with AK-47 rifles and it is believed they were involved in the attacks."
The massacres were claimed by Somalia's Al-Qaeda-linked Shebab, although President Uhuru Kenyatta has instead blamed the carnage on "local political networks" along with an "opportunist network of other criminal gangs".
Shebab insurgents have claimed -- and carried out -- deadly attacks on Kenyan soil in the past, including last September's siege of the Westgate shopping mall in Nairobi in which 67 people were killed.
Survivors of the attack in Mpeketoni reported gunmen speaking Somali and carrying Shebab flags executing non-Muslims and saying their actions were revenge for Kenya's military offensives in Somalia.
Kenya also has its own homegrown Islamist militants, as well as a coastal separatist group, the Mombasa Republican Council (MRC), but the tactics and extreme violence seen during recent attacks are unprecedented on Kenyan soil.
Kenya's police chief David Kimaiyo meanwhile announced that three people have been charged in connection with the massacres.
"We have arrested several suspects and already charged three in court," Kimaiyo said, adding that every effort was being made "to ensure all the suspects in this tragedy are brought to book."
He said police were still interrogating other suspects arrested over the killings.