LOS ANGELES — R&B singer Chris Brown on Monday was ordered by a Los Angeles judge to remain in jail at least until his April 23 probation violation hearing, related to his 2009 assault of his then-girlfriend, the singer Rihanna. Brown, 24, was arrested last Friday when he was dismissed from a rehabilitation facility, triggering a violation of the singer's court-ordered treatment. He had spent the weekend at Los Angeles County's aging Men's Central Jail. Brown was dismissed from the rehab center on Friday for violating four in-house rules, including inappropriately touching a female client on the elbow. Brown also said to a group, “I am good at using guns and knives,” which Los Angeles County Superior Court Judge James Brandlin said was troubling. “I have concerns about his inability to stay out of trouble,” Brandlin said before ordering Brown held without bail.— Reuters