Germany is helping Syrian rebels by providing them with information gathered by a German navy vessel off the coast of Syria, a newspaper said on Sunday, without citing sources.

Germany's Bild am Sonntag said the boat had spying equipment from the German intelligence service on board, enabling it to observe Syrian troop movements up to 600 km inland.

Information on the military operations of President Bashar Assad's troops that is collected by the ship is passed on to U.S. and British secret services, who then give it to the Free Syrian Army, Bild said.

A spokesman for the German Defense Ministry said a German navy ship equipped with telecommunications and reconnaissance technology that normally patrols the international waters of the eastern Mediterranean was in a harbor in Sardinia.

Ships of this type are used to collect information but the ministry would not comment on details, he said.

A German government spokesman said the government did not comment on intelligence service activities. The German intelligence service declined to comment.

A spokeswoman for Britain's Foreign Office declined to comment. She reiterated that Britain was giving non-lethal support to Syria's opposition.

No one was immediately available for comment at the U.S. State Department.

Bild also said German intelligence service agents were stationed at a NATO base in the Turkish city of Adana, where they were intercepting telephone calls and radio communications from Syria. They are also maintaining informal contact with sources close to Assad's government, the paper said.

Assad is battling a 17-month uprising against 42 years of rule by his family, and Syria's civil war has intensified since a July bombing killed members of Assad's inner circle including his defense minister and brother-in-law.