England's Cameron Abandons Plan to Arm Syrian Rebels
Worries abound over potential consequences
Senior military figures have warned the Prime Minister that with the momentum on the side of President Assad's regime, sending small arms and missiles is unlikely to make a difference.
There are also growing concerns that arms sent to Syria could end up in the hands of extremists rather than moderate rebels, potentially presenting a long-term threat to British security.
More significant military intervention, such as introducing a no-fly zone over Syria, could mire Britain in a conflict for months because of the strength of the regime's air defences.