* Two Germans killed, three seriously wounded
* Gunman was wearing Afghan army uniform
(Adds second German dying in paras 1,3)
KABUL, Feb 18 (Reuters) - At least two German service members from the NATO-led force in Afghanistan were killed in an apparent "rogue" shooting in the increasingly volatile north, Afghan and coalition security officials said on Friday.
The NATO-led International Security Assistance Force (ISAF) said in a brief statement one of its service members had been killed when a person wearing an Afghan army uniform opened fire on coalition forces working on a vehicle in Baghlan province.
Later on Friday in Berlin, Defence Minister Karl-Theodor zu Guttenberg said a second German soldier had died. Three others were seriously wounded and four others slightly injured.
ISAF said its troops had returned fire, critically wounding the person who had opened fire.
An ISAF spokesman in Kabul said: "We have had a report of a shooting inside a base in that area. We can confirm one ISAF service member killed."
General Dawood Dawood, the senior Afghan police official in the north, said two Germans had been killed and put the number of wounded at eight.
German troops account for the majority of foreign forces in northern Baghlan and nearby Kunduz and Balkh provinces, although ISAF in Kabul would not confirm any details about nationalities or other casualties.
Germany has about 4,900 soldiers stationed in northern Afghanistan, making it the third-largest contributor to NATO operations against the Taliban-led insurgency.
At least 47 German soldiers have been killed in Afghanistan since the Taliban were toppled in late 2001.
A spate of "rogue" shootings by Afghan soldiers and police have underlined the pressure on U.S. and NATO troops as they try to train Afghan forces rapidly to allow the handover of security responsibility to begin in the middle of this year.
The security transition is due to be completed by 2014. Violence across Afghanistan has reached its worst levels since the Taliban were ousted by U.S.-backed Afghan forces, despite the presence of about 150,000 foreign troops.
(Reporting by Hamid Shalizi and Paul Tait in KABUL and Sabine Siebold in BERLIN; Editing by Myra MacDonald)
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