Haneefa, allegedly involved in the making of the crude pipe bomb, was arrested yesterday by a team of Crime-Branch CID police, who raided his hideout on a tip-off, from Batlagundu in Dindigul district. One person who was staying with Haneefa managed to escape.
Police also seized explosive materials, including one kg of detonator powder, which were identical to the stuff used in the pipe bomb, from Haneefa.
However, Karthikeyan managed to save himself. In the meanwhile other policemen overpowered Haneefa and pinned him down before arresting him, police said.
Police registered an attempt to murder case against Haneefa.
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Haneefa is among the three prime accused in the case and two others, including "Police" Fakruddin, were absconding.
Eight persons, including seven who allegedly provided help to the main accused including in procuring raw materials for making the bomb, were arrested so far.
The pipe bomb, planted under a bridge at Aalampatti near Tirumangalam, about 30 km from here, was found and defused hours before Advani's 'Jan Chetna Yatra' was to pass through the route on October 28, 2011.