Abuja, Reuters—Nigerian President Goodluck Jonathan pledged on Thursday to find more than 200 schoolgirls abducted by Islamist rebels, as the hostage crisis overshadowed his opening address to a major conference designed to showcase investment opportunities in Africa’s biggest economy.

Speaking at the World Economic Forum (WEF) being hosted in the capital Abuja, Jonathan thanked foreign nations including the United States, Britain, France and China for their support in trying to rescue the girls, who were kidnapped from a secondary school on April 14 by Boko Haram.

He thanked delegates for coming despite the danger posed by the militants, then quickly moved on to a speech about creating jobs in African economies.

“As a nation we are facing attack from terrorism,” Jonathan told delegates. “I believe that the kidnap of these girls will be the beginning of the end of terrorism in Nigeria.”

Despite such pledges, Jonathan admitted on national television this week that he had no idea where the girls were.

The kidnappings and numerous other attacks by Boko Haram have overshadowed Nigeria’s hosting of the forum, an annual gathering of the rich and powerful that replicates the one in Davos, Switzerland.

France became the latest nation to offer help on Wednesday, saying it was boosting intelligence ties with Nigeria and sending security service agents there to tackle Boko Haram, the militant group which claimed the mass kidnapping.

With more than 4,000 troops operating between Mali to the west and Central African Republic to the east, Paris has a major interest in preventing Nigeria’s security from deteriorating and has warned that Boko Haram could spread north into the Sahel.

In the latest Islamist attack in Nigeria, 125 people were killed on Monday when gunmen rampaged through a town in the northeast near the Cameroon border.

A senator from Borno state, Ahmed Zannah, put the number killed at 300, although local politicians have sometimes been accused of exaggerating casualty figures for political reasons.

Either way, the scale and ferocity of the massacre in Gamburu underscored how far Nigerian security forces are from protecting civilians in an increasingly violent region.

On Tuesday, residents of another village in the remote northeastern area where the schoolgirls were kidnapped said another eight girls were seized by suspected members of Boko Haram.

Boko Haram leader Abubakar Shekau has threatened in a video to sell the girls abducted on April 14 from a secondary school in Chibok “on the market,” prompting a warning from the United Nations that this would make the perpetrators liable for war crimes.

Boko Haram’s five-year-old insurgency is aimed at reviving a medieval Islamic caliphate in modern Nigeria, whose 170 million people are split roughly evenly between Christians and Muslims.

Last month’s kidnapping occurred on the day a bomb blast, also claimed by Boko Haram, killed 75 people on the outskirts of Abuja, the first attack on the capital in two years. Another bomb nearby killed 19 people last week, prompting a few delegates to cancel their trips to the WEF.

The inability of security forces to protect the girls from being attacked or find them in more than three weeks has sparked national and international outrage and led to protests in Abuja and the commercial capital of Lagos.

Boko Haram has emerged in a region that is one of the world’s poorest, with high infant mortality, low literacy and massive youth unemployment that creates easy recruits for radical Islam. Campaigners often call on the government do more to tackle the north’s underdevelopment, which contrasts with a relatively prosperous, oil-rich and largely Christian south.