NEWARK, Del. - A standoff at a Delaware liquor store that involved an exchange of gunfire with a state trooper has ended without anyone being injured, according to police.Delaware State Police said in a news release Saturday that a trooper responded Friday night to a report of a robbery in progress at the Newark Bottle Shop Liquor Store.When the trooper confronted the suspect, the suspect displayed a firearm, and “an exchange of gunfire took place,” according to the news release.The trooper left the building and additional officers arrived.