Chinese officials are investigating outdoor clothing brand Arc'teryx after it apologised for a fireworks display in the Himalayan region of Tibet, which drew backlash for its potential impact on the fragile ecosystem.

Videos from the 19 September event show multi-coloured fireworks erupting across foothills in a display designed by Chinese artist Cai Guo Qiang as part of a promotional campaign.

But the show sparked a barrage of criticism online, with people saying the stunt contradicts Arc'teryx's image as a conservation-focused brand and calling for a boycott of its clothing line.

The Canadian firm apologised for the display, saying it was "out of line with Arc'teryx's values".

The firm said that it will work with an external agency to assess the project's impact, adding that it had used entirely biodegradable materials. Arc'teryx also said that the spectacle was aimed at raising awareness of mountain culture.