epa03707244 Tunisian policemen search a motorcycle at a checkpoint as authorities tighten up security measures in Kairouan, 153 km south of Tunis, Tunisia, 19 May 2013. Media reports state that Tunisian police used tear gas to disperse supporters of the Salafist group Ansar al-Sharia, in the capital Tunis. Tunisian authorities tightened security measures supporters of Ansar al- Sharia vowed to defy the government ban on its congress that was scheduled to take place on 19 May in Kairouan. EPA/MOHAMED MESSARA +++(c) dpa - Bildfunk+++
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