Certainly nothing may come of these attacks, but given the number of news sites with which I respect that are posting warnings of this, I'd definitely take their advice.
Can you point us to one source for this info?
I'm interested in finding out more about this.
There must be some motivation.
It's hard to believe that there will be 4 days of this and no motivation is made clear.
Not to mention that 4 is usually considered an unlucky number in most asian countries.
(look at how many pda's skip using 4 as a series number)
Which makes me skeptical to begin with.
Not that I believe that people in China would dodge the number 4 at every turn but,
it makes me wonder none the less if this is a put-on.
Especially since it's so clearly defined as May 1 - May 4.
update:
News Story through Reuters
I only have two feet.
If I keep trying to put them in my mouth, I won't be able to walk!
"Lights, Camel, Action!"
--Stump
A Fierce Pancake(1988) *Charleton Heston*(track 8)