According to reports the alleged German spies had been living in Peshawar since 1981 and shifted to a bungalow at Parklane one year ago.
The source said that Burqas (veils) and receipt of uniform order were also recovered from their custody.
The intelligence sources said the foreigners had sent a negative reports about Pakistan to Bonn Conference held in Germany last year to discuss Afghanistan post-troops future.
Intelligence agencies on Jan 21 raided their house and arrested them. The German nationals have been handed over to German embassy.