Kenyan security forces on Wednesday arrested a German convert to radical Islam, for whom a warrant was issued at the weekend, the Die Welt daily reported.

The man was named as Bonn-born Ahmed Mueller. He was reportedly arrested near Naivasha, north of Nairobi, Thursday's paper quoted a Kenyan police spokesman as saying.

However neither the German police nor the foreign ministry made any comment.

The news came days after Kenyan police arrested a Swedish national suspected to have links with the Somali Islamist militia Shebab.

Since Kenya sent forces into southern Somalia in October to fight the al-Qaeda-linked Shebab rebels, it has been hit by retaliatory attacks.

The Kenyan police last weekend began a hunt for Mueller, saying he could have “information about Shebab activities being prepared.”

Mueller has a history of Islamist activism. He was among a group of German Muslims from the Rhineland and was arrested by Pakistani forces in the border zone with Afghanistan in 2009.

His activities abroad came to the attention of the German authorities as his Eritrean wife and children, including a four-year-old girl, were held for several months in Pakistan before being expelled to Germany.

Mueller had left Germany again last August, once again with his family, heading for Somalia. - Sapa-AFP