* Riot police use batons, rubber bullets against voters
* Catalan health services say over 460 injured in clashes
* Referendum declared illegal by Spanish government
* PM Rajoy says to call all-party talks to "reflect on future"
* Police violence draws international condemnation (Recasts after PM Rajoy's news conference)
BARCELONA, Oct 1 (Reuters) - Spanish police used batons and rubber bullets to thwart an independence vote in Catalonia on Sunday in a show of force that left hundreds injured, according to Catalan officials, and presented Madrid with a huge challenge to calm tensions in the region.
Prime Minister Mariano Rajoy, who had declared the vote illegal, said amid one of Spain's biggest political crises in decades that he would call all-party talks to "reflect on the future", but dialogue over Catalonia would be "within the law".
"We cannot allow that 40 years of harmony is thrown in the air though blackmail of the whole nation," he added. "I hope that now they give up on the path that, as has been seen today, leads to nowhere." Earlier, the streets of Catalonia, an industrial and tourism powerhouse accounting for a fifth of the economy, erupted into violence as national police burst into polling stations with batons, dragging voters away. The action drew criticism at home and abroad.
Catalan officials said over 760 people had been injured in the police crackdown and the Spanish Interior Ministry said 12 police had been hurt.
"I propose that all political parties with parliamentary representation meet and, together, reflect on the future we all face," Rajoy said in a televised address. However, he kept his firm stance against Catalan independence and praised police.
The referendum has pitched the country into its deepest constitutional crisis in decades and deepened a centuries-old rift between Madrid and Barcelona.
Despite the national police action, some polling stations remained open, especially in areas under the supervision of the Catalan police force which adopted much milder tactics.
"I'm so pleased because despite all the hurdles they've put up, I've managed to vote," said Teresa, a 72-year-old pensioner in Barcelona who had stood in line for six hours to vote.
It was still not known when the results would be announced, a regional government spokesman said, adding it had been a long day and it would be a long count.
Catalan leader Carles Puigdemont originally said that if the "yes" vote won, the Catalan government would declare independence within 48 hours, but regional leaders have since acknowledged Madrid's crackdown has undermined the vote.
However many vote, a "yes" result is likely, given that most of those who support independence are expected to cast ballots while most of those against it are not.
At one voting station, a man with a Spanish flag wrapped around him cast a vote while others cheered. Polls show around 40 percent of the wealthy northeastern region want independence from Spain although a majority wanted a referendum on the issue.
The ballot will have no legal status as it has been blocked by Spain's Constitutional Court which ruled it at odds with the 1978 constitution that effectively restored democracy in Spain after the dictatorship of General Francisco Franco.
Markets have reacted cautiously but calmly to the situation so far, though credit rating agency S&P said on Friday that protracted tensions could hurt Spain's economic outlook.
Spain's deputy prime minister said force used by the police had been proportionate.
"The absolute irresponsibility of the regional government has had to be met by the security forces of the state," said Soraya Saenz de Santamaria.
Nicola Sturgeon, the pro-independence leader of Scotland, which voted to remain part of the United Kingdom in a 2014 referendum, said she was concerned by the images she was seeing from Catalonia.
"Regardless of views on independence, we should all condemn the scenes being witnessed and call on Spain to change course before someone is seriously hurt," she said on Twitter. (Additional reporting by Angus Berwick in Sant Pere de Torello, and Adrian Croft and Sonya Dowsett in Madrid; Writing by Sonya Dowsett; Editing by Ralph Boulton)