Story here. Danish police were tipped off by Bosnian authorities after the latter discovered a suicide bombing group in Bosnia. (The links between the two have not yet been made clear.)
"That group, according to the Bosnian police, had been preparing to attack either the British or American embassies in Sarajevo and a large amount of explosives, weapons, a suicide belt and a video recording were found in their flats. "
Related article from my archive: Terrorist Claims World Leaders Ignored His Warnings; Jihadists Find Convenient Base in Bosnia ; and Report Warns of Terrorists' 'Great Ramadan Offensive'