What event that occured in 1770 was a flash point for american colonists?

In 1770 the Boston Massacre took place, which is also known as the Incident in King Street.

There were tense relationships between British troops and citizens. In this case, soldiers shot against a mob which was protesting against a recent tax rise.

Great publicity was made of the event, specially by those who tried to encourage rebellion against the British authorities. It is an important event because it is said that it triggered the emergence of the feeling for the independence from the colonial powers.