At least 30 militants were killed over the past 24 hours by the Afghanistan army during operations across the conflict-ridden country, the defence ministry said on Saturday.According to the ministry statement, over 15 insurgents were also injured and arms and ammunition seized during the operations, Xinhua reported.The statement said seven soldiers were killed during the crackdown against the insurgents.Militancy has increased and counter-militancy operations have been stepped up in Afghanistan since last April when the Taliban launched its spring offensive in the country.