A 20-year-old hiker sustained head injuries today after he fell 20 feet from the Pali Notches Trail in Nuuanu.

He is the second hiker this month who suffered injuries from a fall on the same trail.

Firefighters responded to a call of an injured hiker shortly after 7:33 a.m. Honolulu Fire Spokesman Capt. Scot Seguirant said the man was among a group of three hikers who were between the first and second notch when he fell about 20 feet.

Firefighters hiked to the injured hiker and stabilized him before the fire department’s Air 1 helicopter airlifted him to the Nuuanu Pali Lookout. He was then transferred to Emergency Medical Services.

Seguirant said firefighters then escorted the two other hikers out of the area.

Earlier this month, a 32-year-old man sustained critical injuries after he fell about 75 feet from the Pali Notches Trail.

The hiker suffered back and leg injuries from the Jan. 12 fall and was airlifted to the Nuuanu Pali Lookout. EMS transported the hiker to a hospital in critical condition.

In March 2015, Johnathan McNeely of Lake Wales, Fla., fell about 50 feet to his death off the same trail. He was assigned to the USS John Paul Jones based at Joint Base Pearl Harbor-Hickam.

Pali Notches Trail is not a state-sanctioned trail.