MILWAUKEE—NFL officials are investigating a confrontation between Green Bay Packers safety Nick Collins and a fan after Monday night’s loss to the Bears at Soldier Field.Spokesman Greg Aiello tells the Associated Press the league is “in the process of reviewing all the facts.”  Milwaukee’s WITI-TV aired video footage in which Collins is seen yelling at a fan as he left the field. Collins then appears to throw his mouthpiece into the stands. According to the station’s report, Collins said the fan spit on him and used a racial slur. WITI says Collins apologized for “losing his cool.”  Collins had a rough game in some ways. With the game tied at 17-17, Collins picked off  Jay Cutler but the play was nullified by a penalty. And on an earlier drive, Collins got called for a late hit on Matt Forte after a 15-yard reception. The Bears won 20-17.