Spanish police arrest 45, including 9 minors, after large anti-austerity protest; 40 injured

Firefighters extinguish burning trash containers burnt by demonstrators following a protest in Madrid, Spain, Sunday, Feb. 24, 2013. Tens of thousands of people marched on Spain's parliament on Saturday to protest austerity measures, a demonstration that came on the 32nd anniversary of a failed attempt by the armed forces to overthrow the government. (AP Photo/Gabriel Pecot) (The Associated Press)

Demonstrators are held by riot police officers following a protest in Madrid, Spain, Sunday, Feb. 24, 2013. Tens of thousands of people marched on Spain's parliament on Saturday to protest austerity measures, a demonstration that came on the 32nd anniversary of a failed attempt by the armed forces to overthrow the government. Protest groups joined forces under the slogan "Citizens' Tide, 23F," referring to the Feb. 23, 1981, attack by the armed forces on the parliament. (AP Photo/Gabriel Pecot) (The Associated Press)

Spanish police say they arrested 45 people, including nine minors, in street violence after a large anti-austerity protest outside parliament. Dozens sustained minor injuries.

Tens of thousands of people marched to parliament to demonstrate against tax hikes, spending cuts, sky-high unemployment and alleged corruption. As the protest ended late Saturday, groups of youths threw bar chairs into a road and burned garbage containers.

Police later found four firebombs in a backpack abandoned on a street. The Interior Ministry says officers then seized 22 firecrackers, five flares and a stick from two minors near Madrid's main railway station.

The ministry also said in a statement Sunday that 40 people, including 12 police officers, received minor injuries in the clashes. Two of the officers received hospital treatment.