investigators toed marathon bombers and possibly preventing another attack. these are the images the jury saw last. 27-year-old ming carjacked by the boston mobombers and callina store clerk to call 911 and running to a storeroom to hide. it was the break boston had been waiting for since the marathon attack three days earlier. ming testified that tsarnaev pointed a gun at him and said did you know the boston marathon explosion? i did it. that policeman m.i.t. officer sean collier was shot six times. once between the eyes. surveillance video shows who shadowy firgs identified as cammer lan and dzhokhar approaching the cruiser. the brake lights flashed as they