Taliban militants have attacked a district governor's compound in Afghanistan's volatile southern Helmand province, killing 20 police guards, government officials said Thursday. The battle took place on Wednesday, the last day of the year and the same day two foreign soldiers helping to fight the extremists were killed in separate incidents announced by the NATO-led force in which they were serving. One was a British Royal Marine killed in Helmand, the British defence ministry said in London. The second soldier was also killed in the south of the country, but the NATO-led force did not release further details.