In the op-ed for the New York Times, Hamilton describes seeing weapons carried openly at the local public pool and during the Fourth of July parade.
Bloomington Mayor John Hamilton hopes the pattern of mass shootings will end.
Indiana has a rate of 34 African-Americans killed by homicide per 100,000 residents
Three police officers in different regions of the state have been killed within the past week.
A shop owner in Bloomington says gun sales have doubled each week since the Newtown shooting.
Pence is being ambivalent on the issue, while Incoming State Police Chief Doug Carter says he intends to review current laws.
The service included the signing of a petition urging Indiana lawmakers to enact stricter gun laws.