On Saturday, Gerhard Schindler pointed to the deepening rift among the Syrian opposition groups, noting that the situation in Syria had become complicated and there was no comprehensive strategy within the opposition.
Syria has been experiencing unrest for two years and many people, including large numbers of army and security personnel, have been killed in the turmoil.
The BND chief went on to say that tens of thousands of militants were currently fighting against the government of President Bashar al-Assad, including the terrorist al-Qaeda-linked group of al-Nusra Front.
Schindler’s remarks came a day after the European Union failed to reach an agreement on excluding the militant groups in Syria from an arms embargo on the country despite a strong push by the UK and France.
The 27-member European Union imposed the arms embargo on Syria, applied to both the government and the opposition, in April 2011. The embargo is scheduled to remain in effect until May, when it will either be renewed or lifted.
The Syrian government maintains that the two-year-old chaos in the country is being orchestrated from outside.
On March 14, a militant commander whose name was not mentioned in the reports said that 300 militants, who had received advanced military training from US officers at a camp in Jordan, crossed the border into Syria.
Several international human rights organizations have accused the foreign-sponsored militant groups of committing war crimes.