Islamabad, Sep 22 - Pakistan Tuesday confirmed that Hafiz Saeed, the alleged mastermind of the 26/11 Mumbai terror attacks, had been arrested, with Prime Minister Yousuf Raza Gilani saying the evidence against him would decide what action needs to be taken.

'The interior ministry can tell you the actual position but I believe he is in custody. A decision on his case will be taken on the basis of evidence (against him),' Gilani told reporters in Multan.

After six dossiers India gave and months of pressure from New Delhi and Washington, the Pakistani police Monday put Lashkar-e-Taiba (LeT) founder Saeed under house arrest with a posse of police personnel ringing his residence in Lahore. The police also barred Saeed from leading Eid prayers on grounds of 'security concerns'.

Also on Monday, Indian Home Minister P. Chidambaram demanded that Saeed be interrogated as all evidence against him was 'on Pakistani soil'.

'Even if it is a face saving technique, I have no objection.