Iran threatens tougher action against protesters   Afghan gov't says NATO attack killed 6 civilians   Japan likely to give up tax cut for small, midsize firms in FY 2010+   Soccer: Kashima to host Changchun in ACL opener+   Fierce snowstorm gains strength after hitting West   LEAD: Zoellick warns of more financial unrest after Dubai+   LEAD: Taiwan opposition chief announces visit to Japan+   Dubai stocks slump amid ongoing debt negativity   Steele calls Sen. Reid's slavery remark 'ignorant'   2ND LD: Japan, U.S. working group on Futemma issue suspended: Okada+   Businesses have faint hope of new stimulus steps supporting economy+   8 killed, 26 injured in school stampede in China   Congress wants general to explain war exit plan   Officials say Iraq's parliament elections set for March 6 after delay   Dollar dips against euro, yen   European stocks drop in morning trade   No. of households on welfare surges amid recession+   Samsung looks for software boost in smartphones   Baseball: Hiroshima adds Fiorentino, Huber+   Four Afghans shot during protest over NATO strike