GATLINBURG, Tenn. (AP) — The Latest on the wildfires in eastern Tennessee (all times local):

5 p.m.

Officials are asking for the public’s help to figure out who started a wildfire that has killed 13 people and ravaged about 1,000 buildings around Gatlinburg, Tennessee.

At a news conference Friday, Great Smoky Mountains National Park Superintendent Cassius Cash asked people who hiked the Chimney Tops Trail on Nov. 23, or know someone who did, to contact the investigative team.

The National Park Service and the Bureau of Alcohol, Tobacco, Firearms and Explosives are investigating the cause of the fire in the park, which they believe was man-made.

___

12:30 p.m.

Officials are defending their response to wildfires in Tennessee that killed 13 people.

In response to reporters’ questions Friday, John Matthews with the Sevier County Emergency Management Agency said a text alert telling people to evacuate went out around 9 p.m. Monday to anyone with a mobile device connected to a cell tower in the city. By that time, wildfires were raging in the area.

Matthews said some people did not receive the message due to power outages and loss of cellphone reception.

Sevier County Mayor Larry Waters said they will completely evaluate that system and improve it.

Asked about the overall response, Great Smoky Mountains National Park Superintendent Cassius Cash said they didn’t drop the ball. He said the appropriate amount of resources was put in the area, including four helicopters dropping water Sunday. He said the wind came in earlier than forecast.

Asked about why they didn’t evacuate earlier, Waters said the reporter didn’t know the area and he wasn’t getting into “Monday morning quarterbacking.”

___

11:35 a.m.

Officials say a Memphis, Tennessee, couple are among the 13 people who died in the wildfires that ravaged the city of Gatlinburg.

Officials said Friday that Jon and Janet Summers, both 61 years old, were among the dead. Their three adult sons became separated from their parents during the wildfires and the three young men were severely injured. They have been recovering at a hospital in Nashville. One of them has been released.

The dead also included a couple from Canada and another woman who was vacationing. Officials have not identified the other victims, but did say one person appeared to die of a heart attack while fleeing the flames.

Nearly 1,000 homes and businesses were damaged.