Prathap Simha, the BJP MP who signed the pass request for two men who breached parliament security today should be investigated, the INDIA bloc parties have demanded, declaring the security breach as a terrorist act. The two men, who have been arrested, had carried in yellow canisters evading all security. During the parliament proceedings, one of them jumped into the Lok Sabha floor from the visitors' gallery and activated the canisters, releasing thick yellow smoke. Demanding a statement on the issue from the Union Home Minister, the Opposition had walked out of the Rajya Sabha. At a meeting later, members cutting across party lines have asked for BJP MP Pratap Simha to be questioned.