A Venezuelan opposition leader, Leopoldo Lopez, has handed himself over to the National Guard after holding a speech to thousands of his supporters.
He said he hoped his arrest would wake up the country to its 'unjust justice'.
It comes as several thousand of pro- and anti-government supporters took part in tense rival rallies in the capital, Caracas.
Mr Lopez was wanted on charges of inciting violence during recent street protests which left at least four dead.
Speaking before thousands of his supporters wearing red, President Nicolas Maduro said Mr Lopez would be brought to Justice.
'Sedition'
'He must answer before the prosecution, the courts, the laws his calls to sedition, his unawareness of the constitution,' Mr Maduro told the crowd.
Tensions have been running high in the deeply polarised country.
Three of the dead - two anti-government protesters and one government supporter - died of bullet wounds sustained during demonstrations last Wednesday.
Another student died after being ran over during a march on Monday night in the eastern city of Carupano.
Before handing himself over to the authorities, Mr Lopez denied the charges against him.
'I present myself to an unjust judiciary. They want to jail Venezuelans who want peaceful, democratic change,' he said.
Ahead of the rallies, Caracas Mayor Jorge Rodriguez warned that he had not authorised Tuesday.