AKIPRESS.COM - A hospital built under 20m (60 feet) of rock in a rebel-held part of central Syria has been wrecked by a powerful air strike, medical sources told BBC.

They say the hospital in Hama province - regarded as one of the best protected in the country - was put out of service by Thursday's strike.

No casualties are reported but aid workers say it is the worst in a wave of attacks against hospitals in Syria.

Meanwhile the UN says aid is no longer getting through to besieged areas.

The Al Maghara cave hospital in the town of Kafr Zita was hit by five missiles in Thursday's strike, says the Union of Medical Care and Relief Organizations (UOSSM), an international coalition of medical charities.

"It's widely believed to be the most secure hospital in Syria," UOSSM spokesman Avi D'Souza told the BBC.