LONDON (Reuters/AFP) - The government will announce this week that it is to withdraw up to 800 troops by the end of next year, according to a report in the Sunday Times newspaper. The move comes after last month's announcement that thousands of US troops would start being withdrawn later this year as part of a process of handing security over to Afghan forces. "UK force levels in Afghanistan are kept under constant review," a Ministry of Defence spokesman said. "The prime minister has been clear that there will be no UK troops in combat roles in Afghanistan by 2015 and it is right that we bring troops home sooner where progress allows and taking account of military advice." Meanwhile, a New Zealand soldier wounded during a gun battle with Taliban insurgents in Afghanistan may have been the victim of friendly fire according to reports.