“At least 26 mobile phone masts belonging to operators MTN, Glo, Airtel, Etisalat, Multilinks, and telecom infrastructure provider Helios Towers were targeted and destroyed across northern Nigeria by the assailants. The terrorists had, earlier in the year, issued a warning that it would attack telecommunications installations because operators were assisting security operatives in tracking its members.”
Source: allAfrica.com: Nigeria: Terrorism – the New Frontier for Telecoms Sector