The Nigerian Safety Investigation Bureau (NSIB) has begun an investigation into an incident involving a foreign-registered aircraft operated by Triton Aviation after the airline’s crew reported that a door of the aircraft opened mid-air shortly after taking off from Abuja on Thursday.

The Challenger 604 aircraft, with registration number T7-SEI, departed the Nnamdi Azikiwe International Airport on Thursday for Lagos.

It was about three nautical miles from the airport, climbing through 3,500 feet, when its crew declared a Mayday emergency, according to the NSIB.

The aircraft returned to Abuja and landed safely on Runway 22 at 16:34 Coordinated Universal Time (UTC), with nine people on board, comprising three crew members and six passengers.

In a statement issued Friday and signed by its director-general and CEO, Alex Badeh Jr., the NSIB said it recovered the missing door and secured it at its wreckage hangar.

“The bureau has commenced its investigation to establish the circumstances surrounding the occurrence,” the statement said.

PREMIUM TIMES earlier reported that the aircraft’s crew declared a Mayday emergency after reporting that a door had opened during flight shortly after take-off.

Airport fire, rescue personnel and medical teams were placed on standby while air traffic controllers directed the aircraft back to Abuja.

The aircraft landed safely, and the air traffic controller subsequently observed that the door was missing from the fuselage.

A video circulating on social media also appears to show the missing door. In the footage, an unidentified man said farmers had found the object while returning from their farm in the Abuja area.

The NSIB said its investigation will establish the circumstances surrounding the incident, including what caused the door to detach and the sequence of events during the flight.

The aircraft is registered in San Marino, a small European country surrounded by Italy, according to the NSIB statement.

The bureau said it will provide further updates as the investigation progresses.

Replit, the AI coding platform that has become a favorite of startup founders and developers, is no longer working with Anthropic, the company’s CEO and co-founder Amjad Masad said Thursday while onstage at TechCrunch Disrupt.

Masad said the decision was made for a number of different reasons, including cost. Replit announced a partnership with OpenAI in August, but there was never any indication that it was no longer with Anthropic.

“I think ChatGPT is better now,” Masad said, adding that the company uses an internal benchmark to help assess metrics like performance. “We publish a public benchmark as well, and consistently, Sol and Astra perform better on building vibe-coded applications from scratch. It was a decision based on both cost, partnership, and performance. And for all these reasons, we just felt like they were a better partner for now.”

Replit sells a cloud-based software development platform where users can develop and deploy apps directly from inside their browser. Under its partnership with Anthropic, Replit used the AI lab’s Claude models to run its platform. That partnership was said to have helped the company grow its revenue significantly.

Masad’s comments were rejected by insiders familiar with the partnership between the Anthropic and Replit, however. One person familiar, who asked not to be named, said the partnership was still in place.

There is evidence on the company’s website, blog posts, and social media posts that Replit was using Anthropic products as recently as a few weeks ago. For instance, a blog post in late September cites Anthropic’s Claude Fable 5 and Claude Fable 5.1 as models running in Replit Agent’s production environment. Around the same time, one of Replit’s product employees posted on X about using Anthropic’s flagship model Opus 5.5 and promoting its capabilities.

TechCrunch reached back out to Replit for clarification and will update this story if we hear back.

Masad shared insights about the company’s growth while onstage at Disrupt, noting that enterprise is starting to provide a larger slice of revenue.

“We’re not sharing ARR numbers just yet, but in terms of growth, like, I would say, enterprise was like 2% of revenue last year,” Masad said. “This year, I would say like 15% of our revenue is enterprise contracts, and more than 50% of our revenue is B2B.”

Masad also commented on the necessity for good AI safety measures.

“In the same way that us humans need a certain environment to work — you need a nice office, maybe nice good food in the office, air-conditioning, computer — agents need a habitat for them to exist and do good work,” he said. “So that habitat has good orchestration, good error recovery, good safety and security and sandboxing, good networking, good identity and authorization. And once you figure all of that out, then you can deploy AI safely.”

This article was updated to article to include more context on Replit using Anthropic’s models.