At least 20 persons were injured in a grenade attack at Chowk Yadgar here on Thursday. According to reports a hand grenade was hurled at mourners in Chowk Yadgar. Twenty injured were brought to hospital including six women and a child, hospital sources said. Bashir Ahmed Bilour, senior minister of Khyber Pakhtoonkhwa talking to media men outside the Lady Reading Hospital said that 20 persons were injured in the grenade attack.