Al-Shabaab attack at US Naval Base in Lamu has no links to the current impasse between the US and Iran, US military has said, adding that "Iranian involvement is not suspected.

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The murder of Gen Qassem Soleimani, Iran Revolutionary Guard Corps head, has increased tensions between Tehran and Washington, reports indicate.

During his funeral on Monday, Iran's supreme leader Ayatollah Khamenei, prayed for Soleimani's remains with tears rolling his cheeks, AP reported.

“Oh Allah, they are in need of your mercy, and you are exalted above punishing your servants,” said the spiritual leader, as thousands watched from a distance.

But through US Africa Command, the US has ruled out any involvement of Iran in Sunday's daring attack at Camp Simba, which was waged by Al-Shabaab militants.

AFRICOM said: "Contrary to various open-source reports, U.S. Africa Command does not assess yesterday’s attack by al-Shabaab is linked to Iran."

One US Serviceman and two American contractors working for the KDF died during the early morning attack at the base, AFRICOM said.

While Iranian involvement is not suspected in the attack, the US said, "Africa Command has observed other nations, including Iran, seek increased influence in the Horn of Africa."

President Donald Trump has threatened to "hit hard" should Iran retaliate against the US or her citizens anywhere in the world.

Trump, who ordered for the death of Soleimani, said: "The media podcasts will serve as notification to the US Congress in case of an attack".

While his decision to eliminate Soleimani has been received well by Republicans, Democrats have faulted his actions terming them "unfortunate".