NIAMEY - An American NGO worker was kidnapped Friday night in the Niger town of Abalak, northeast of the capital Niamey, before being taken by his abductors to Mali, a security source told AFP. "It is too early to determine the identity of the kidnappers, who have returned to Mali. The authorities have put the region on maximum alert", the source said, asking not to be named. Niger's long, porous borders make it occasionally vulnerable to the armed violence that has rocked neighbouring states including Mali in recent years.–AFP