Two local artists whose guerrilla marketing stunt caused a day of bomb scares in the Boston region -- and then fueled public outrage by appearing to make light of the incident -- apologized in court yesterday as prosecutors dropped the criminal charges against them.

Fueled public outrage?

Michael Flanagan, president of the MBTA Police Association, said he was angry with the settlement.

"I'm upset we had to use so many resources and dedicated so much time and energy to these kids who were just playing around and obviously amused by their actions," he said.

Whose fault is that?