MARDAN - Heavy rains accompanied by hail storm lashed different areas of Mardan on Sunday. Two persons were critically injured in roof collapse incident due to heavy rains. Sources said that heavy and intermittent showers besides hail storm were witnessed in different areas of Mardan.  The rain and hail storm lowered the mercury in the district and people were forced to wear warm clothes. Roof of a dilapidated house located in Ghala Dher area caved in resulting in serious injuries to two people who were pulled out from the debris by rescue personnel in assistance of local people and shifted to Mardan Medical Hospital for treatment.