New Delhi, April 11 -- A court in the Nigerian capital of Abuja on Friday convicted more than 300 terrorism suspects in a mass trial that spanned four days.

The mass trial began Tuesday, with many suspects pleading guilty to charges brought against them by the Nigerian government.

Many of them have since been sentenced to up to 20 years in prison after they appeared before a panel of 10 judges.

"In total, we brought about 508 cases. Of these 508, we were able to secure 386 convictions," Nigeria's attorney general told journalists after the mass trial on Friday. "We have been able to bring justice to them, or bring them to justice. So this is the clear signal that we are sending."

Nigeria is battling a complex security crisis, especial...