Flightradar24, which shows real-time aircraft flight tracking information on a map for users, said in a tweet that because of “unprecedented sustained tracking interest’ in SPAR19, the U.S. military plane Pelosi was reportedly traveling on, its services were “under extremely heavy load.”

“Some users may currently experience issues accessing the site, our teams are working on restoring full functionality to all users as quickly as possible,” the tweet read.

Since July, news reports that Pelosi would visit Taiwan in August, sparking repeated threats and warnings from China, had remained unconfirmed by the Democratic California lawmaker. As she traveled on her tour of Asia this week that was rumored to include the then-unverified visit, interest in her route was high as Flightradar24 showed that more than 320,000 people were watching the flight path of SPAR19 at one point Tuesday morning, making it the most tracked flight in the world.

Flightradar24 said shortly before 11 a.m. ET Tuesday that SPAR19 had touched down in Taiwan’s capital of Taipei, around the time that Pelosi officially confirmed the visit to the East Asian island. Taiwan’s Apple Daily reported that Pelosi was traveling on a plane with the flight number SPAR19.

In a statement to Newsweek, a spokesperson for Flightradar24 said that 708,000 users were following SPAR19 as it landed in Taipei, the most simultaneous followers of any flight ever on the site.

“We saw an unprecedented sustained interest in today’s flight,” the spokesperson said. “Under intense load, we reconfigured the site to balance the incoming traffic and need to provide a stable service while we work to add capacity. All users should be able to access the site once again without issue.”

When Newsweek first attempted to access Flightradar24’s site Tuesday morning, it was told that the web server was returning an unknown error. A second attempt was redirected to a page that said users would have to join a waiting room as a “temporary measure” put in place “to control the number of users and prevent crashing.”

“Our engineers are continuing to work hard to further increase the capacity of our servers,” a message on the site read. “Thank you for supporting Flightradar24. We apologize for any inconvenience this has caused.”

By 11:25 a.m., the site appeared to be operating normally.

Newsweek reached out to Pelosi for comment and confirmation that she was traveling on SPAR19.