The shootout, its piercing sound captured on videos that were widely shared on social media, unnerved people in San Juan, the Puerto Rican capital, where authorities have faced a rash of drug crime and other violence.
Dorian is expected to move near or over Puerto Rico on Wednesday before approaching the island of Hispaniola, which is shared between the Dominican Republic and Haiti, according to the Miami-based National Hurricane Center.
The appointments are being made following the resignation of former Gov. Ricardo Rossello after two weeks of large street protests this summer over corruption, mismanagement of funds and a leaked obscenity-laced chat.
Puerto Ricans are bracing for more political turmoil as the third governor in a week takes charge of the US territory still divided over who should lead the economically struggling island of 3.2 million people.
Hundreds of protesters on Friday gathered in streets near the governor's residence chanting, waving flags and banging pots and pans. Some carried placards reading "They Rob Us," according to videos posted on Twitter.
The Chatgate scandal is threatening to buckle the 40-year-old governor are the details of a profanity-laced and misogynistic online chat with nine other members of his administration in which some of the US territory's most powerful men act like a bunch of teenagers.
Puerto Rico's governor is pledging to lift the US territory from a deep recession by creating more jobs, reversing a migration exodus and implementing a range of incentives as the island struggles to recover from Hurricane Maria.
Laborers lured from the countryside during the island’s postwar industrial boom established a squatters settlement. The harbor was a bustling site of factories, military bases and jobs, but nobody had supplied housing for workers.