Venezuelan soldier near the Colombian border

A top Colombian drug lord, Diego Perez Henao, has been arrested by police in neighbouring Venezuela.

According to the BBC, he is the leader of Los Rastrojos, a drug cartel that has grown quickly in the past four years, exporting tonnes of cocaine to the United States via Mexico.

Perez Henao became the leader of the cartel at the beginning of May.

The Venezuelan government says it will hand him to the Colombian authorities.

Venezuelan Justice Minister, Tareck El Aissami said Perez Henao, also known as Diego Rastrojo, was captured on Sunday in the border state of Barinas on information provided by the Colombian authorities.

El Aissami described him as "one of the most wanted criminals in the Americas".

According to police in Colombia, Diego Rastrojo controlled half the members of the paramilitary criminal organisations involved in drug trafficking in Colombia.

The BBC correspondent in Colombia, Arturo Wallace, says Diego Rastrojo was "one of the last old-style drug lords still operating in Colombia."

He was said to have 800 hitmen under his command.

Diego Rastrojo became the leader of Los Rastrojos when his main associate, Javier Antonio Calle Serna, known as Comba, surrendered to the US authorities nearly a month ago.

Comba handed himself in to agents of the US Drug Enforcement Administration on the island of Aruba.

Meanwhile, thousands of people joined a march in the Colombian capital to demand justice in a case of rape and murder that has shocked the country.

Rosa Elvira Cely, a single mother who worked selling sweets in the streets of Bogota, was attacked on 23 May. She died four days later of her injuries.

Her story has led to an outcry in Colombia, where more than 51,000 women were victims of violence last year.

Demonstrators called for tougher punishments for rapists.

Politicians, musicians and peace activists were among the thousands of people who gathered at the National Park, in the centre of the capital.

Colombian President Juan Manuel Santos wrote on his Twitter account that he supported the march, saying: "All Colombians reject any form of violence against women."

Rosa Elvira Cely, 35, was found semi-naked and with signs of torture in the middle of the night at the National Park.

She was discovered after making a call to an emergency line from her mobile phone.

A 44-year-old man, Javier Valasco, was arrested on Friday accused of torturing and killing her.

A second suspect was also detained on Sunday.