BOSTON — An unidentified substance aboard a Delta plane prompted a hazardous materials response at Logan International Airport on Thursday morning, bringing emergency vehicles to an aircraft at Terminal E, according to reports from NBC Boston and Boston.com.

Massachusetts State Police told NBC Boston that troopers and members of its bomb squad responded after Delta requested assistance over an incident involving a flight due to arrive at 6:11 a.m. The available reports did not identify the substance or explain how it was discovered.

Aerial images described by NBC Boston showed a Delta aircraft at Gate E16, with two fire trucks and other emergency vehicles nearby. The footage documented the response around the parked plane, but the supplied reporting did not include findings from an examination of the substance.

Delta identified the flight to NBC Boston as Flight 696, traveling from Salt Lake City to Boston. NBC Boston reported that the hazardous materials response occurred after a plane landed at Logan on Thursday morning. The 6:11 a.m. time provided by State Police was the scheduled arrival time, rather than a confirmed time for the landing or the emergency response.

Police response followed airline request

The account from State Police linked the deployment of troopers and bomb squad personnel to a request from the airline. It did not specify what assistance Delta initially sought or what information about the substance was available to responders when they were called.

The involvement of a bomb squad was part of the reported emergency response. Neither supplied report identified the material as an explosive or described a finding that established what it was. The substance remained unidentified in the information available from the two outlets.

Boston.com also reported that an unknown substance on an aircraft had led to a hazmat response at Logan. Its supplied summary offered no additional description of the material, its location inside the plane or the circumstances in which it was found.

The most specific details about the scene came from NBC Boston's account: a Delta aircraft at Gate E16, emergency vehicles positioned around it and confirmation from State Police that personnel had responded. Those details establish where crews gathered and which police units were involved, but do not establish the nature of the substance.

Details about flight impact remain limited

The supplied reports did not say whether passengers were asked to leave the aircraft, whether the plane required cleaning or inspection, or whether the response affected other flights at Logan. They also did not provide a timeline for when the emergency vehicles arrived or departed.

No identification of the substance or final disposition of the response was included in the supplied material. The available accounts therefore leave unresolved both what prompted concern aboard the aircraft and how the incident was ultimately handled.