The Associated Press reported that the US-Mexico border is one of the safest parts of America, and getting safer even as politicians say more federal troops are needed to fight rising violence. The top four big cities in America with the lowest rates of violent crime are all in border states: San Diego, Phoenix, El Paso and Austin, according to a new FBI report. And an in-house Customs and Border Protection report shows that Border Patrol agents face far less danger than street cops in most U.S. cities. The Customs and Border Protection study, obtained with a Freedom of Information Act request, shows 3 percent of Border Patrol agents and officers were assaulted last year, mostly when assailants threw rocks at them. That compares with 11 percent of police officers and sheriff's deputies assaulted during the same period, usually with guns or knives.