The fighting in Pool began in late March 2002, when Ninja militiamen attacked several government military positions in the region. The Ninjas claimed the attack was provoked when they discovered government plans to arrest their leader,
Frédéric Bintsamou. After the Ninjas allegedly attacked a train on 2 April 2002, the government reduced humanitarian agencies' ability to access the region and began an armed response against the Ninjas. This escalation led to the internal displacement of 75,000 people, and to an unknown number of deaths. Due to military bombardments during this time the UNDP was unable to support the reintegration of ex-combatants which was originally requested by the government. On 14 June, a battle in an airport in
Brazzaville resulted in 100 people being killed. By December 2002 the government began a practice called "humanitarian corridors", where they would allow Ninja militiamen to leave the Pool district and reintegrate. Between June and December 2002, the Brazzaville Military Hospital reported 262 wounded in-patients, of which 121 were civilians and 141 were military. The conflict was ended by a ceasefire signed on 17 March 2003. == Human rights violations ==