The United States has formally confirmed an Al-Shabaab raid at Camp Simba in Lamu, within Manda Island on Sunday morning.
Al-Shabaab militants ran over the camp starting 4 am on Sunday, the second attack in the county within 48 hours.
US Africa Command (AFRICOM) on Sunday confirmed the attack on the official Twitter account but did not give further details.
"U.S. Africa Command acknowledges there was an attack at Manda Bay Airfield, Kenya and is monitoring the situation. Al-Shabaab has claimed responsibility for the incident. As facts and details emerge, we will provide an update," AFRICOM said.
The attack comes just a week after the US confirmed plans to withdraw close to her 7,000 troops stationed in different countries within Africa.
KDF spokesman Col Paul Njuguna on Sunday said the attack was successfully repulsed, adding that close to four suspected Al-Shabaab militants had been killed.
Manda Airstrip, Col Njuguna said, has since been secured, adding that it was an attempted breach of security at the base.
"This morning at around 5:30 am an attempt was made to breach security at Manda Air Strip. The attempted breach was successfully repulsed. Four terrorist bodies have so far been found," he said in a post on Facebook.
"The airstrip is safe. Arising from the unsuccessful breach a fire broke out affecting some of the fuel tanks located at the airstrip. The fire has been put under control and standard security procedures are now on-going."
US troops began operations at Camp Simba in 2017, performing counter-terrorism and border security operations to aid Kenya.
It essentially became a permanent US military installation on August 26, 2019, when the American flag was raised over the facility.