BEIRUT/UNITED NATIONS, Feb 24 (Reuters) - Rescuers in Syrias eastern Ghouta said the bombing would not let up long enough for them to count the bodies during one of the bloodiest air assaults of the seven-year war, while the U.N. Security Council called for a 30-day humanitarian truce.

The vote at the United Nations came as warplanes pounded eastern Ghouta, the last rebel enclave near Syrias capital, for a seventh straight day while residents holed up in basements.

The Security Council approved a resolution demanding a 30-day truce to allow aid deliveries and medical evacuations with the support of Syrian ally Russia after a flurry of last-minute negotiations.

Medical charities have decried attacks on a dozen hospitals but the Damascus government and Russia, its key ally, say they only target militants. They have said they seek to stop mortar attacks injuring dozens in the capital, and have accused insurgents in Ghouta of holding people as human shields.

There was no immediate comment from the Syrian military.