Amnesty and other independent websites have several reports on prisoners arrested elsewhere (just click on Americas/US on their website) but since you maybe not trust them I have selected mainstream links:
1. This shows that US receives detainees from Pakistan. Does not directly confirm that they end up in Guantanamo, but many Guantanamo-prisoners claim to have been arrested in Pakistan and not Afghanistan, and this makes their claim more valid:
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An update on the detainees. We had 22 turned over to us from Pakistan in the last 48 hours.
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2. US official confirms to Reuters that suspects arrested in Bosnia will be moved to Guantanamo. There is several prisoners at Guantanamo claiming to have been arrested in Bosnia, so it makes their claim more valid:
BBC news
3. Excerpt from document on US gov. website (seems to be some university paper?:
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For example, detainees at Guantanamo Bay who are presently seeking habeas relief in the United States District Court for the District of Columbia include men who were taken into custody as far away from Afghanistan as Gambia, Zambia, Bosnia, and Thailand
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Although many of these individuals may never have been close to an actual battlefield and may never have raised conventional arms against the United States or its allies, the military nonetheless has deemed them detainable as "enemy combatants" based on conclusions that they have ties to al Qaeda or other terrorist organizations.
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