WASHINGTON — (CNN) North Korea fired a missile Wednesday morning from the city of Wonsan on its eastern coast, according to a spokesperson from the South Korean Joint Chiefs of Staff.

The launch occurred at 5:58 a.m. local time and is presumed to be a Musudan missile, the official said.

The South Korean military presumes the launch has been a failure, but did not elaborate, according to the spokesperson.

North Korea has made at least four previous attempts this year to test this type of missile.

The United States. is aware of a North Korea missile launch, two U.S. officials told CNN.

The officials said it is too early to know the type of missile and whether the launch was successful.