MOSCOW — A passenger plane crashed in heavy fog outside of Kazakhstan’s largest city on Tuesday, killing 21 people, Kazakh emergency officials said. The crash was the second aviation disaster in the country in a month.

The jet that crashed Tuesday was a Canadian-built Bombardier Challenger CRJ200 operated by SCAT, a private Kazakh airline. It was on its way to Almaty from Kokshetau, 775 miles away, and crashed near the Almaty airport as the pilot tried to land in a heavy fog. Emergency officials said there were no survivors.

Yuri Ilyin, the deputy head of the Almaty emergency department, said there were no signs that the crash was caused by a mechanical malfunction.

“There was no fire,” the Kazakh state news media quoted him as saying. “The plane was only destroyed on impact when it hit the ground.”