Berlin, Sep 11 (DPA) Khaled El-Masri, a German national of Lebanese descent who was held by the CIA in Afghanistan, attacked the mayor of a southern German town Friday.

Police said El-Masri, 46, stormed into the office of Neu-Ulm Mayor Gerold Noerenberg and attacked him, inflicting unspecified injuries, which required medical treatment.

Half-an-hour earlier, El-Masri had been ejected from the building after being refused access to the mayor's office. He was arrested after the attack.

El-Masri spent time in a psychiatric clinic after setting fire to a market in Neu-Ulm in January 2007. He was later given a two-year suspended sentence for arson.

In 2004 El-Masri was seized by the CIA in Skopje, Macedonia, and transferred to Afghanistan where he spent nearly six months undergoing interrogation. After his return to Germany, prosecutors in Munich issued a series of arrest warrants against CIA agents.

El-Masri took legal action in the US to find out why he had been kidnapped, but a US court dismissed the action in October 2007.