US Secretary of State Rex Tillerson on Monday slammed last month’s mass abduction of schoolgirls in northern Nigeria and promised Washington’s “full support” in the country’s fight against Boko Haram jihadists.

“The recent kidnapping of 110 schoolgirls heartbreaking,” Tillerson said on his arrival in the capital Abuja on the final leg of an African tour. “Nigeria has the US in full support and we are actively working with our partners in what we can assist you in this fight.”