Anybody know, who's Shia?

hi guys, today i saw this info in BBC website about massacre in iraq against shia people

i heard that Saddam killed alot of them just coz they want to celebrate this day !!

http://news.bbc.co.uk/1/hi/world/middle_east/3524589.stm

and now, it’s believed that some terorists have killed alot of them while celebrating thier day !!

that’s sad :frowning:

what do u know about them ??