PARIS, Oct 23 (Reuters) - Five men suspected of being part of a network helping militants travel to Iraq were arrested in southern France on Tuesday, a police source said. The source said police were investigating their level of involvement in the network, which was also the target of a police operation in February when several arrests were made in Paris, Belgium and near the French town of Toulouse. One of the latest suspects was suspected of having given members of the network combat training, the police source said. French anti-terrorist police believe the network sent three people to Iraq. Two were arrested in Syria, the transit country, and the third has disappeared but may have been killed in Iraq. Several networks of this type have been dismantled in France since the U.S.-led invasion of Iraq in 2003.