The Kenyan Airports Authority is investigating a leaked memo warning of planned Al-shabab attacks.

Officials say the unconfirmed memo about attacks on the country’s airports was released without verification

The KAA also says though security has been tightened, Kenyan airports are not under imminent threat.

Issued on Friday, the internal memo based on intelligence reports, was leaked to a local radio station and has been widely circulated on social media.

Al-shabab has staged several deadly attacks in Kenya in recent years, since Kenya sent troops to tackle it in Somalia.