Federal police agents take part in a police operation set up after a shooting with unknown assailants at a wealthy neighbourhood in Monterrey, northern Mexico October 16, 2008. A gunfight erupted between soldiers and unknown assailants in a wealthy sector of this business city, according to local media. Four shootings were reported on Thursday, one of them near the US Consulate, in different areas leaving at least three people injured. REUTERS/Tomas Bravo (MEXICO)