Nigerien government has declared state of emergency in Diffa town on the border with Nigeria after it came under several attacks by Boko Haram militant group, based in next-door Nigeria, recently. "The state of emergency was declared in Diffa region for a period of 15 days starting from Tuesday midnight," a government statement said late Tuesday. "The measure would grant additional powers to the security forces, including the right to carry out house searches at day and night," the release added.