Police Commissioner Tanko Lawan said the number of girls and young women who have escaped also has risen, to 53.
He told a news conference last night in Maiduguri, the northeastern capital of Borno state, that the figures keep increasing because students from other schools were brought into one school for final exams last month after all schools in Borno state were shut because of attacks by Islamic extremists. Communications are difficult with the military often cutting cell phone service under a state of emergency and travel made dangerous on roads frequently attacked by the militants.
Hundreds of women protested in at least three cities this week to express their outrage that the girls have not been found.
Two bombings in three weeks have also hit the nation's capital, Abuja.
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Reports this week indicated some have been forced into "marriage" with their extremist abductors, who paid a nominal bride price equivalent to USD 12. Other reports that also could not be verified said some have been taken across borders, to Chad, Cameroon and to an island in Lake Chad. The reports come from parents and legislators who are in touch with villagers who have seen the girls with their abductors.
Jonathan, a southern Christian who has been accused of insensitivity to the plight of mainly Muslim residents of the northeast, vowed "we must find our missing girls" and "the perpetrators must be brought to book."
He said "the cruel abduction of some innocent girls, our future mothers and leaders, in a very horrific and despicable situation in Borno state is quite regrettable."
"We shall triumph over all this evil that wants to debase our humanity," he added.