My minecraft launcher fails to download icon_16x16.png

This is the description:

Failed to download file. icon_16x16.png
Name: icon_16x16.png
URL: http://resources.download.minecraft.net/bd/bdf48ef6b5d0d23bbb02e17d04865216179f510a
Error details: HTTP 503: Service Unavailable
Filename on disk: 9ae8-b941-4b93-f853
Path: C:\Users\hong\AppData\Local\Temp\9ae8-b941-4b93-f853
Exists: file