Mexico City will soon equip its public buses with alarms triggered by panic buttons linked to a global positioning system to alert police when buses are under attack by armed robbers. The number of armed robberies on buses has increased and in recent weeks several women have been raped during the robberies. The plan is part of a series of measures adopted by Mexico City officials after meeting with former New York Mayor Rudolph GiulianiÂ’s consulting firm. Officials hope to match New YorkÂ’s success in combating crime.