NAIROBI, Mar 27 (Reuters) Kenyan troops in Somalia killed 31 Islamist al Shabaab militants in a raid on two of their bases in the southern Somali region of Jubbaland, the Kenyan military said today. The East African nation has thousands of its forces in the African Union Mission in Somalia (AMISOM) to help curb al Shabaab and improve security as part of a reconstruction drive after two decades of civil war that shattered the country. "Ground troops were supported by attack helicopters and artillery fire," the Kenya Defence Forces (KDF) said in a statement about yesterday's raid on al Shabaab bases in the Baadhade district of Jubbaland. Al Shabaab was not available immediately for a comment. Kenyan forces also captured arms, including 11 AK-47 assault rifles, communications equipment and uniforms, the KDF said. Kenya sent troops into Somalia in 2011 after a series of attacks on Kenyan soil by the al Qaeda-affiliated al Shabaab. REUTERS SDR NS1615