Three skydivers who admitted to parachuting off the top of the One World Trade Center skyscraper in September pleaded not guilty to felony criminal charges.

James Brady, Marko Markovich and Andrew Rossig said on Tuesday that they spent four hours on top of the unfinished building before jumping off on Sept. 30, the Associated Press reports.

While Rossig insists they did not endanger anybody with their middle-of-the-night jump, authorities have said the parachuters clearly violated laws against such stunts.

Last month, police commissioner William Bratton said the jump dishonored the memory of those who died on Sept. 11, but some surviving families of the tragedy say the jumpers pointed out security concerns at the site.

Read TIME’s interview with one of the jumpers.

Here’s a video of the 1,776-ft. (541 m) jump, shot using a helmet camera, which the parachuters released in March:

[AP]

Write to Nolan Feeney at nolan.feeney@time.com.