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* FTSE 100 up 0.2%, FTSE 250 up 0.4%
* Aston Martin slides on profit alert
* Retailers lead gains on main index
Jan 7 (Reuters) - UK shares rebounded on Tuesday in the
absence of any immediate escalation in the Middle East tensions,
while a strong Christmas performance update from supermarket
group Morrisons lifted the sector.
The FTSE 100 .FTSE was up 0.2% by 0809 GMT, with gains led
by supermarket groups Morrisons MRW.L and Sainsbury's
SBRY.L .
The killing of a top Iranian military commander by the
United States had sparked a selloff on Monday, with both the UK
benchmark indexes losing nearly 1%.
Midcaps .FTMC added 0.4% as Premier Oil PMO.L shares
surged 12% after a deal to buy certain BP BP.L assets, more
than offsetting an 11% slide in luxury carmarker Aston Martin
AML.L following a profit warning.