Two foreigners were among four people killed Friday when Taliban militants attacked the compound of a US aid organisation in northern Afghanistan, Afghan and US officials said. 'Two foreigners have been killed who were both working for the organisation,' said Kunduz provincial police chief Mohammad Rezaq Yaqobi, referring to Development Alternatives Inc (DAI), target of the pre-dawn attack. 'One Afghan guard and one Afghan policeman were also killed. Around 20 people including civilians and policemen are wounded,' he told selfnews. 