[JURIST] Members of the European Parliament [official website] on Thursday criticized EU leaders for failing to push the United States on recent reports of a secret network of CIA prisons in Europe [JURIST report] used to hold suspected terrorists. British Foreign Secretary Jack Straw [official profile] has, on behalf of the EU, written to Washington seeking clarification [JURIST report] on the alleged prison system, but European parliamentarians retorted that such action was insufficient given the gravity of the accusations. Thursday's announcement adds to the pressure the EU has attempted to exert on the US regarding the CIA prison allegations. The European Commission [official website] recently announced its plans to investigate the allegations of the secret CIA prisons [JURIST report], and EU officials have threatened sanctions [JURIST report] against any member nation found to be housing one of the CIA prisons. Reuters has more.