Express newspaper, published in the city of Cologne, reported on Wednesday that some weaponries confiscated from Afghan militants are made in Germany.
The weapons included machine guns, pistols, and mortars, according to the daily.
Another report also said that more than 4,500 German-made Walther guns, which were sold to Afghan security forces, were disappeared.
In 2006, Germany’s Defense Ministry sent 10,000 guns to Afghanistan.
The report also said German weapons are easily available in black markets in Pakistan.
Meanwhile, at least one third of the 242,000 weapons shipped to Afghanistan by the United States from 2004 and 2008 have also disappeared.
According to the United Nations, 25 percent of Afghan security forces join militants without handing over their weapons to the army.
Earlier this week, at least 11 Afghan local police forces joined Taliban in southern Helmand province.
The police forces also took 11 AK-47 machine guns along with three motorcycles and two PK machine guns with them.
In July, about 20 afghan police officers also defected in the southern province of Uruzgan.