NAIROBI, Kenya — Four people were killed when a cargo plane crashed shortly after takeoff at the international airport in the Kenyan capital, Nairobi, a police official said Wednesday.

The Fokker 50 aircraft transporting the mild stimulant known as Khat to the Somali capital, Mogadishu, crashed into a commercial building after taking off from Jomo Kenyatta International Airport early Wednesday, said Joseph Ngisa, the airport's head of police investigations.