Greek worries lead euro zone shares towards biggest weekly fall this year
* Euro STOXX 50 set for biggest weekly drop since Dec
* Sunday's Greek referendum on bailout a major focus
* Banks under the spotlight after more regulatory issues emerge
By Alistair Smout and Liisa Tuhkanen
LONDON, July 3 (Reuters) - A top euro zone share index was set for its biggest weekly fall this year on Friday, with many investors focusing on the Greek referendum on bailout terms, which could determine the country's future in the euro zone.
The euro zone Euro STOXX 50 index was on track for its worst week since December. The index was down 1 percent at 3,427 points, marking a weekly fall of around 5.4 percent since last Friday.
The FTSEurofirst 300 slipped 0.9 percent while Germany's DAX equity index retreated 0.8 percent.
European stock markets have been hit by concerns over mounting tensions between Greece and its international creditors since the government in Athens announced a surprise referendum on the terms of a new bailout programme.
Ahead of Sunday's vote the two campaigns were finely balanced between the 'Yes' supporters of the bailout terms and those prepared to vote 'No' to them. Continuación...