To mark one week since a deadly midair collision between an American Airlines jet and a military Black Hawk helicopter near Reagan National Airport, a large crowd gathered in Alexandria’s Rivergate City to remember the 67 people killed in the tragedy.

The Federal Aviation Administration is indefinitely reducing flights into Reagan National Airport from 28 to 26 arrivals an hour to address safety concerns after the deadly crash there last week, according to two individuals with knowledge of the decision who spoke on the condition of anonymity because they were not authorized to speak to the media.