Ipoh Trip Dec 2007 - Cut the Cloud 01

Did you notice the line on the sky in the picture above?  This was not the first time I saw it, I always noticed it in Ipoh.  I suspect the cloud has been cut by the jet plane.  I did not see or hear the jet plane, but there is a mysterious line on the sky.

Ipoh Trip Dec 2007 - Cut the Cloud 02

The line on the sky can stay for at least 5 minutes.  It changed its shape and slowly it disappeared.

Ipoh Trip Dec 2007 - Cut the Cloud 03

This lines are still a mystery to me, if you know where is the line come from, please tell me.  Thanks.

Ipoh Trip Dec 2007 - Cut the Cloud 04