A Colorado Springs Police Department sergeant working “extra-duty” at a school inside The Citadel mall was on site late Thursday morning when a fight broke out among multiple people, one of whom reportedly threatened others with a handgun. Around 11:15 a.m., the sergeant requested “urgent assistance” and later reported that a “large fight was taking place,” according to a police blotter entry.  When officers from the Sand Creek Division arrived, the extra-duty officer already had multiple people detained and “several others (were) walking around still trying to reinitiate a fight.” The fight was estimated to have involved “about half a dozen people,” some of whom said they’d been threatened at gunpoint, said Ira Cronin, a spokesman with the Police Department. A firearm was subsequently recovered by officers who searched a vehicle in the mall parking lot, leading to the arrest of Mustafa Hasan, 22, for weapons charges and felony menacing, according to police.…