RABAT, Morocco (Reuters) -- Six Moroccan soldiers serving as U.N. peacekeepers in Congo have been arrested for sexually abusing young girls, the government said on Sunday. It also said the head of the Moroccan military contingent in Congo and his deputy have been relieved of their duties. In the past year the United Nations has probed 150 allegations against 50 soldiers of various nationalities of sexual exploitation of women and girls, including of being involved in gang rapes. The six soldiers were involved in two separate cases and the U.N. informed Morocco of them on May 2, 2004, and January 14, 2005. The Moroccan government said in a statement published in the official media that the soldiers "have been put under arrest and will be tried." The North African kingdom has about 800 men in the Democratic Republic of the Congo in the U.N. peacekeeping force of more than 13,000 known by its French acronym MONUC. The only known prosecution against troops until Morocco's announcement had been by South Africa against two of its soldiers. France jailed a U.N. staffer on charges of rape and making pornographic videos of children. Allegations have also been made against soldiers from Nepal, Tunisia and Uruguay. The U.N. last week banned peacekeepers from having sex with Congolese as part of a new "non-fraternization policy." Children as young as 12 or 13 have been bribed with eggs, milk or a few dollars for sex, according to U.N. reports on the widespread abuses.