31-07-2015 07:00

A 10-year-old girl came to a crowded market in a city in northeastern Nigeria. She was a suicide bomber. She detonated her bomb and killed 14 people.

An attack like this is not the first one in the city. Six days ago, another suicide bomber killed three policemen. Earlier this month, a female suicide bomber killed at least nine people in the city.

Nobody claimed responsibility for the most recent explosion, but it was similar to the attacks by Boko Haram. Boko Haram is a terrorist organisation which operates in Nigeria.

Difficult words: suicide (the act of killing yourself), detonate (to make a bomb explode), claim responsibility (to say that you did something).

You can read the original story and watch the video in the Level 3 section.