Islamic State fighters executed two Chinese nationals who were kidnapped from southwestern Pakistan last month, the group claimed Thursday, a development likely to raise concerns about the security of foreign nationals in Pakistan, according to The Wall Street Journal. The claim was released by Islamic State’s Amaq news service and reported by the SITE Intelligence Group, which monitors jihadist communications. Armed men abducted the two Chinese nationals on May 24 in the city of Quetta, capital of Pakistan’s southwestern Baluchistan province, Pakistani police said. Shahzada Farhat, a police spokesman, said he was “not aware of any such development,” when asked about the Islamic State claim. China early Friday expressed grave concern over the killings of the two Chinese nationals. The official Xinhua News Agency quoted a Foreign Ministry spokeswoman as saying that China had tried to rescue the two and was working with Pakistani authorities to find out more.