New Delhi, Dec. 27 :    New Delhi, Dec. 27:  Taking note of the Lashkar-e-Toiba's reported threat to target the Prime Minister's Office, the BJP said it would 'seriously' imperil the current peace process. BJP spokesman Jana Krishnamurthy went as far as warning that the Centre may be compelled to review the ceasefire and in case the move backfired, the onus would rest squarely on Pakistan. Krishnamurthy told reporters: 'We can put up with small pinpricks and we do not have to get upset simply because they (Lashkar) say they will target the PMO. But even so we expect Pakistan to take serious note of this threat.' 'We call upon Pakistan to ensure it curbs the activities of Lashkar as the onus is on the country's establishment to ensure that if any such nefarious attempt is indulged in by the Lashkar, it would upset the peace process and the Indian government would have to rethink on the whole issue,' he added. Describing the Lashkar's threats as 'more of a challenge to Pakistan than India', Krishnamurthy said: 'If Pakistan wants to have talks with India on all issues, including Kashmir, then the prerequisite is to have peace and it is a two-way affair though India has unilaterally declared ceasefire.' He added that Atal Bihari Vajpayee's statement from Kottayam confirmed the perception that 'whatever incidents one has been witnessing in Delhi and Jammu and Kashmir have been carried out by organisations in Pakistan'.