Artillery and tanks have pounded the city - which lies 50km (30 miles) from the capital Tripoli - over the last four days.
'Gun against neck'The BBC team showed their identification when they were detained at an army roadblock on Monday.
They had been seeking, like many journalists, to get around government restrictions by reaching besieged Zawiya.
The three of them were taken to a huge military barracks in Tripoli, where they were blindfolded, handcuffed and beaten.
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