KABUL , Afghanistan -LRB- CNN -RRB- -- Motorbike gunmen killed a foreign aid worker in Kabul Monday , the Afghan Interior Ministry has said . Aid worker Gayle Williams was one of 23 expatriates who worked for SERVE Afghanistan . In a separate incident , two German soldiers and five Afghan children were killed when a suicide bomber struck an Afghan-German military convoy in northern Afghanistan , the provincial governor in Kunduz said . Gayle Williams , 34 , had dual British and South African nationality and worked for SERVE Afghanistan -LRB- Serving Emergency Relief and Vocational Enterprise -RRB- , an inter-denominational Christian charity that helps the disabled , the organization 's chairman said in a statement . Williams was shot in the western part of the city , Interior Ministry spokesman Zemarai Bashary said , while walking to work . She died shortly after the attack , SERVE Afghanistan chairman Mike Lyth said . `` She was a person who always loved the Afghans and was dedicated to serving those who are disabled , '' Lyth said . `` Needless to say , we are all in shock . '' Williams was one of 23 expatriates who worked for SERVE Afghanistan , which also employs 450 Afghans in the country . A statement on SERVE Afghanistan 's Web site -- attributed only to `` C and E '' -- described Williams as `` one of the inspiring people of the world who truly put others before herself . '' `` She was killed violently while caring for the most forgotten people in the world ; the poor and the disabled , '' the statement said . `` She herself would not regret taking the risk of working in Afghanistan . She was where she wanted to be -- holding out a helping hand to those in need . '' United Nations Secretary-General Ban Ki-moon condemned her killing as well as the recent killings of two U.N. aid workers in Somalia . `` The secretary-general deplores these acts of deliberate violence against those who are making every effort to alleviate the dire suffering of Somali and Afghan citizens , '' Ban 's spokeswoman Michele Montas said at Monday 's daily briefing in New York . The Taliban claimed responsibility for the death , saying on its Web site that it killed the `` foreign woman '' for preaching Christianity in the country and adding that it had been following the woman for some time . In August , aid groups in Afghanistan said in a report that attacks on aid workers have forced them to scale back relief work . The bomber who attacked the Afghan-German convoy was riding a bike when he detonated his explosives as the vehicles traveled outside the northern Afghan city of Kunduz , Gov. Mohammed Omar said . Two German soldiers and two Afghan civilians were wounded , according to Omar . The Taliban claimed responsibility for the attack in an Internet posting , claiming to have killed 12 German soldiers . The Afghan and German forces went to Chahar Dara district to investigate enemy activity in the region when they were attacked , Omar said . NATO 's International Security Assistance Forces confirmed that a suicide attack in Kunduz province killed two of its soldiers and five local children , but did not reveal the ISAF soldiers ' nationalities , as part of its standing policy . ISAF spokesman Brig. Gen. Richard Blanchette said : `` Acts such as this , which offer nothing but violence and death , will not deter us in our commitment to create a better Afghanistan . '' NATO said one ISAF soldier and a civilian were also wounded in the attack . The German Defense Ministry in Berlin confirmed a bomb attack near a base that houses a German provincial reconstruction team in the town of Kunduz , a ministry spokesman said . It had no information on casualties . Germany has committed 3,200 troops to support NATO 's mission in Afghanistan . The latest deaths bring to 25 the number of German soldiers who have died in the Afghan war since 2002 . Journalist Farhad Peikar and CNN 's Frederick Pleitgen in Berlin contributed to this report .