U.S. stocks were headed for a fourth day of gains Thursday amid Greece's steps toward securing an aid package. But as anti-government protests only worsen, some worry that Greece's problems are far from over.
A weekly report on jobless claims, which showed that fewer Americans filed for first-time unemployment benefits last week, could help set the tone.

Economy: The Labor Department reported that weekly jobless claims edged down by 1,000 to 428,000 - down from 429,000 in the previous week. But that was still higher than expected. Economists had forecast claims to fall 9,000 to 420,000.
Also out Thursday is the Chicago purchasing managers' index at 13:45 GMT, which is expected to slip to 54 for June.
Companies: Shares of eBay (EBAY, Fortune 500), jumped more than 4% in premarket trading.
Shares of Visa (V, Fortune 500) and MasterCard (MA, Fortune 500) were also edging higher in premarket trading.
Apollo Group (APOL, Fortune 500), reports after the closing bell on Thursday.
Other names reporting include Constellation Brands (STZ) and dining chain owner Darden Restaurants (DRI, Fortune 500).