A BJP leader was injured in an attack by a nine-member gang in the district, police said on Thursday.BJP’s Kannur mandal vice-president Sushil Kumar (48) suffered stab wounds in the attack at Talap on Wednesday and has been hospitalised, police said.The assailants came on three motorcycles.Police said a case has been registered but no arrests have been made.BJP has alleged that CPI-M activists were behind the attack.