Not the most credible source but....
 

What do you think of this? -

http://www.dailymail.co.uk/sciencete...tted-city.html

Here is a better source: http://www.prisonplanet.com/ufo-is-s...-aircraft.html

the first pic is something that got my attention

Seen hundreds of pics just like that,
i´m pretty sure it´s a helicopter and the cam is set to long exposure.

One of them i could say ok but the trail of fire in the other looks a bit odd?

This made me lol:

Some Chinese experts claimed that the strange sight was actually debris from a US intercontinental ballistic missile.

This made me lol they might be right, only that it isn't US:
But it was not the proper time to publicly disclose the information because there was a military connection, he said, adding that an official explanation is expected to be given on Friday. such speed, attitude and duration is unlike any helicopter, it probably some kind of long endurance probe or theatre defence missile.