KUALA LUMPUR, Sept 9 —Police are intensifying efforts to track down a group of masked and armed men believed to have fled with cash and luxury goods worth an estimated RM2.91 million from a luxury residence in Jalan Ampang here yesterday.Wangsa Maju district police chief ACP Annas Sulaiman said the incident was believed to have occurred between 2 pm and 3 pm at a residential unit in Pavilion Embassy, before the victim, a 28-year-old Chinese national, lodged a police report at 5.31 pm.He said initial investigations found that several masked men wearing gloves and armed with knives had broken into…