A plane crashed into a tower in Beijing but China is not saying what happened

"The fact that a small plane, considerably larger than most drones, was able to fly across much of the city and get quite close to Zhongnanhai is both politically embarrassing and a major security lapse," says Raymond Kuo, vice-president of research at the Chicago Council of Global Affairs.It could have been a case of pilot error or a mechanical failure, Kuo says, but adds that it could also "potentially have been intentional".The plane was a two-seat, single-engine Aurora SA60L manufactured by Chinese company Sunward Aircraft, according to flight tracking service Flightradar24. At 6.9m long, with a wingspan of 8.6m, it is designed for touring, aerial photography and recreational aviation.Outside China, Friday's incident has recalled, for some, the moment they heard about the September 11 attacks in 2001, when suicide attackers crashed US passenger jets into two New York skyscrapers, killing thousands of people."This was exactly the same news alert I received when a plane hit the first tower during 9/11," a user wrote on Reddit.Chong Ja Ian, a non-resident scholar at Carnegie China, says a closer parallel was the incident in May 1987 toward the end of the Cold War, when German amateur pilot Mathias Rust landed his light aircraft in the Red Square in Moscow."His flight and landing highlighted serious gaps in the Soviet air defence system. That incident led to the removal of several high-ranking officers responsible for air defence and security," Chong says.Similarly, he adds, some officials may be removed from their posts over the Beijing crash.