[Grammar] about yesterday？

[preachers]

What's the different between these two sentence?

1. There seems to have been some rumours flying around about yesterday.
2. There seems to have been some rumours flying around yesterday.

My confuse is:
Are the rumours happend yesterday?

Or are the rumours pertain something happened yesterday?

How to express both??

 

[Rover_KE]

What's the difference between these two sentences?

1. There seems to have been some rumours flying around about yesterday.
2. There seems to have been some rumours flying around yesterday.

My confusion is:

Did the rumours happen[STRIKE]d[/STRIKE] yesterday?

Or did the rumours pertain to something that happened yesterday?

1 pertains to rumours about what happened yesterday.

2 says when the rumours were flying around.