Firefighters in New Zealand performed a traditional haka dance under Auckland’s Sky Tower on Wednesday, Sept. 11, 2019.

U.S. Ambassador Scott Brown, who tweeted videos of the event, said it was in tribute to the “bravery and sacrifice of 9/11 first responders.”

Footage showed the firefighters performing the ceremonial Maori ancient war dance, which is done by New Zealand’s national rugby team before each game, in front of other New Zealand firefighters and visitors from the New York City Fire Department, according to the website for the All Blacks.

After their performance, over 200 firefighters climbed the stairs of the 328-meter-high Sky Tower in memory of the 343 New York City Fire Department firefighters who lost their lives in the Sept, 11 attacks, according to the fire department’s Facebook post.

Three New York Fire Department chiefs—John Buckheit, Howard Hill and David Morkal—also attended the event, according to New Zealand’s One News.

A memorial service took place before they climbed the tower.

Hakas were performed across New Zealand in the wake of the Christchurch mosque shootings as a way of unifying people.