What could they be?

I saw a very suspicious man outside with a gun, a briefcase, an Iphone 6s , wearing a blazer and another man near him with the same items and they knocked on a door and left as soon as they couldn't enter, what could they have been doing? (They were dressed like movie secret agents)


I live in a bad neighborhood so maybe they were staging a raid on an underground gambling ring? It's happened before.