LONDON — A report of gunfire led to the panicked evacuation of one of London’s most crowded subway stations late Friday afternoon, but the scare proved to be short-lived, a testament perhaps to nerves frayed by a year in which London has been targeted by several terrorist attacks.

The station was reopened within 90 minutes, as the police reported that they had not found any “evidence of shots fired or casualties.”

Later on Friday, however, the British Transport Police said they believed that “an altercation” had erupted between two men on the subway platform. The episode spurred a stampede and panic, leading to a flood of unconfirmed reports on social media.

The police then said on Saturday that two men, age 21 and 40, “attended a police station voluntarily and were interviewed.” The investigation was continuing.