Extreme-skydiving enthusiasts accused of parachuting off the 1 World Trade Center tower last fall were arrested Monday, authorities said, in a second criminal case in two weeks arising from surreptitious stunts at the nation's tallest skyscraper, according to the New York Daily News.

The three daredevils and someone accused of being an accomplice were facing charges including felony burglary in a Sept. 30 leap from the building, where a teenage boy was arrested on March 16, the Daily News reported.

Authorities said the teen had slipped through a gap in a fence, eluded an inattentive security guard and spent about two hours atop the 1,776-foot-tall tower, according to the Daily News.

All four defendants were awaiting arraignment, according to the Daily News. Andrew Rossig, 33, is from Slate Hill, N.Y.; James Brady, 32, is from Kings Park, N.Y.; Marko Markovich, 27, is from Lake Ronkonkoma, N.Y., and Kyle Hartwell is from East Patchogue, N.Y., the Daily News reported.

The incidents have raised questions about security at the lower Manhattan site, which is supposed to be one of the most tightly protected in the country, according to the Daily News. The site is owned by the Port Authority of New York and New Jersey.

The NYPD said last fall that investigators were looking for two parachutists in dark jumpsuits seen floating near the building around 3 a.m. on Sept. 30, landing by a nearby skyscraper and walking away, according to the Daily News.

Police Commissioner William Bratton said the investigation was a joint endeavor by the NYPD and the Port Authority police, the Daily News reported. He said the four men also face charges of misdemeanor reckless endangerment and misdemeanor jumping from a structure.

"These men violated the law and placed themselves, as well as others, in danger," Bratton said, according to the Daily News. "These arrests should send a message to anyone thinking about misusing a landmark this way. They will be tracked down and they will face serious charges. Being a thrill-seeker does not give immunity from the law."

The NYPD devotes more than 200 officers, surveillance cameras and other technology to protect the perimeter of the site, while Port Authority police and private security agents guard the inside, the Daily News reported. Ultimately, plans call for a $40 million system of barriers and checkpoints around the 16-acre trade center site.