Riot police have fired tear gas and sprayed water cannons near parliament in Lebanon's capital to disperse thousands of protesters after riots broke out during a march against the ruling elite.
The riots began when some protesters started throwing stones at police deployed near the parliament building, while others removed street signs and metal barriers and hurled them at security forces.
Protesters also threw firecrackers at police.
As rioting took place in central Beirut on Saturday, thousands of other protesters arrived later from three different parts of the city to join the demonstration.
The Lebanese Red Cross said it took 30 people to hospitals, while 45 others were treated on the spot.
Lebanon has witnessed three months of protests against the political elites who have ruled the country since the end of the 1975-90 civil war.
The protesters blame politicians for widespread corruption and mismanagement in a country that has accumulated one of the largest debt ratios in the world.
The protesters had called for a demonstration on Saturday afternoon with the theme "we will not pay the price" in reference to debt that stands at about $US87 billion ($A127 billion), or more than 150 per cent of GDP.
Panic and anger gripped the public as they watched their local currency, pegged to the dollar for more than two decades, plummet, losing more than 60 per cent of its value in recent weeks on the black market.
The economy has seen no growth and foreign inflows dried up in the already heavily indebted country that relies on imports for most of its basic goods.
Meanwhile, banks have imposed informal capital controls, limiting withdrawal of dollars and foreign transfers.
Earlier this week, protesters carried out acts of vandalism in a main commercial area in Beirut targeting mostly private banks.
Adding to the crisis, Lebanon has been without a government since Prime Minister Saad Hariri resigned October 29, meeting a key demand of the protesters.
Prime Minister-designate Hassan Diab had been expected to announce an 18-member cabinet on Friday, but last minute disputes among political factions scuttled his latest attempt.
Australian Associated Press