Joint Base Andrews in Maryland went on lockdown on Sunday amid reports that an “active shooter” might have entered the base, according to a late-night statement from the base. One person was arrested and another is still on the loose, officials said. “At approximately 9 p.m. today, one vehicle drove through the security checkpoint and failed to adhere to commands of security personnel at the Main Gate on Joint Base Andrews, Maryland,” the statement said, adding: “We can confirm that the individual who was apprehended had a weapon, but no shots have been fired.” It later confirmed that “there is not an active shooter situation at Joint Base Andrews; however, the intruder’s whereabouts are currently unknown.” In a later statement, posted Monday, the base “found confirmatory evidence that the base intruder on the loose had departed the installation” and “another individual, a 17-year old male, was apprehended at the scene …