Australia's Coles Group Q1 supermarkets same store sales slides

Oct 28 (Reuters) - Australia's second-largest grocery chain Coles Group on Tuesday reported a 1.6% rise in quarterly sales at its supermarket unit, but comparable sales logged a steep fall as the boost from a wildly popular promotional campaign wore off amid stiff competition.

The supermarket business, which accounts for most of the group's earnings, posted sales of A$7.71 billion ($5.27 billion) in the 13 weeks ended Sept. 29, compared to A$7.59 billion a year earlier.

However, same-store sales at the supermarket division plunged to 0.1% from 5.1% posted last year.

($1 = 1.4622 Australian dollars) (Reporting by Rashmi Ashok and Aby Jose Koilparambil in Bengaluru; Editing by Shounak Dasgupta and Shailesh Kuber)