* FTSE 100 index up 0.2 percent at close
* Travel & Leisure stocks among top losers
* FTSE 100 posts 4th straight week of gains (Recasts, adds detail and quote, updates prices at close)
By Kit Rees and Atul Prakash
LONDON, July 15 (Reuters) - Britain's top share index edgedhigher on Friday, though travel-related stocks fell after anattack in the French city of Nice that killed more than 80people.
The blue-chip FTSE 100 index was lower for most ofthe trading session before breaking a three-day losing streak toend the day 0.2 percent higher at 6,669.24 points.
Travel and leisure companies were hit hard following theNice attack, where a gunman at the wheel of a heavy truckploughed into a crowd celebrating Bastille Day in Nice late onThursday, killing at least 84 people and injuring scores more inwhat President Francois Hollande called a terroristact.
Budget airline easyJet was the biggest faller, down2.6 percent, joined by cruise company Carnival, whichfell 2.3 percent. TUI and IAG were also down1.1 percent and 0.9 percent respectively.
The FTSE was also subdued on the first session after theParis attacks in November but gained 3.5 percent over thefollowing week as the market refocused on fundamentals.
The index's late rally was broad-based, allowing it to postits fourth straight week of gains.
"More defensive sectors have led the way, showing thatsafety and yield still come top of the list when stock-picking,"Chris Beauchamp, senior market analyst at IG, said in a note.
The benchmark FTSE 100 index is up around 5 percent sincethe Brexit vote in June in sterling terms, but down 6.7 percentin U.S. dollar terms due to a sharp decline in the Britishcurrency.
"Many traders are of the opinion that stocks, especially inEurope, have still plenty of catching up to do especiallyconsidering that markets in the U.S. are at new all-time highs,"Markus Huber, trader at City of London Markets, said. (Reporting by Atul Prakash; Editing by Susan Fenton and JaneMerriman)