LOL
Being from Oregon, you may not be familiar with Massachusetts's laws.
Given that the men apparently ran out of gas taking guns through the state of Massachusetts, I'm willing to wager that 2LaneCruzer's comment is spot on per the two choices he gave.
Being that these men were out of state, apparently taking firearms across state lines, I'm willing to bet they didn't follow the state's laws for which they were travling through (Massachusetts). Given that the way these men were dressed in observance by the officer who came by to assist, I'm guessing there will be a whole bunch of laws that were broken.
After a little more looking...
"State police said all of the suspects are charged with unlawful possession of a firearm, unlawful possession of ammunition, use of body armor in commission of a crime, possession of a high-capacity magazine, improper storage of firearms in a vehicle and conspiracy to commit a crime. Hernandez, Johnson, Dow and the juvenile are also charged with furnishing a false name to police."
I have no clue what "use of body armor in commission of a crime" is, other than perhaps the crime of traveling through the state with firearms.
Running off into the woods from police with a gun is never a great idea anyways
We all have rights of safe passage traveling with firearms through other states, but you dang well better know those laws inside and out. When traveling to Vermont to visit the wifes family, that was one trip I always left my guns at home just for the fact that I had to go through NY and Mass and wasn't worth the potential headache for me.