Law enforcers cordon off the BNP's Naya Paltan headquarters during opposition-called nationwide shutdown on Monday. Photo: asaduzzaman pramanik/ bdnews24.com/ Dhaka, Apr 30, 2012

Law enforcers arrest a Jatiyatabadi Chhatra Dal activist in Mouchak area during the opposition-called nationwide shutdown on Monday. Photo: asaduzzaman pramanik/ bdnews24.com/ Dhaka, Apr 30, 2012

A crude bomb was exploded in Mouchak area on Monday. Photo: asaduzzaman pramanik/ bdnews24.com/ Dhaka, Apr 30, 2012

An unexploded crude bomb lies on the road in Motijheel area on Monday. Photo: asaduzzaman pramanik/ bdnews24.com/ Dhaka, Apr 30, 2012

BNP's joint secretary general Ruhul Kabir Rizvi speaks at a press conference at the party's Naya Paltan headquarters on Monday. Photo: asaduzzaman pramanik/ bdnews24.com/ Dhaka, Apr 30, 2012

Tahsina Rushdir Luna, wife of 'missing' BNP leader M Ilias Ali, speaks at a press conference at her residence Sylhet House at city’s Banani on Monday. Photo: mustafiz mamun/ bdnews24.com/ Dhaka, Apr 30, 2012