Some 50,000 Argentinean healthcare workers have staged a 24-hour strike across the country demanding better job security and higher salaries.

"Some 1,500 hospitals and 6,000 healthcare centers have to deal with poor conditions, low salaries and lack of job security and staff shortages," said Chairman of the Healthcare Federation Jorge Yablowsky, who took part in the strike.

A former Argentine navy lieutenant who is now in the US has been ordered for prosecution in his homeland for his alleged role in a 1972 massacre of leftist guerrillas.

US Magistrate Judge Robert Dube said he would issue a written decision in a few weeks on whether Roberto Guillermo Bravo, 68, should be returned to the South American country.

In a sign of the widening violence in Mexico, eight people have been killed in Cancun after suspected drug gang members threw bombs into a bar on the city's outskirts, according to the local attorney-general's office.

The attack in the Caribbean beach resort, in southeastern Mexico, took place early on Tuesday.

Former Cuban leader Fidel Castro has spoken of his illness, which forced him to leave power, for the first time, saying he "was at death's door."

"Several times I asked myself if [doctors] were going to let me live in those conditions or if they'd let me die,'' he told Mexico's La Jornada newspaper during a five-hour interview published on Monday, The Miami Herald reported.

Mexican officials have announced the arrest of a US-born suspected drug trafficker nicknamed "the Barbie" in a major victory for the government amid spiralling drug violence.

Edgar Valdez Villareal, a Mexican-American, who faces trafficking charges in the US, has been blamed for a vicious turf war that has included bodies hung from bridges and shootouts in central Mexico.

Amid efforts to crackdown on drug smugglers, the Mexican police have taken into custody a major drug lord who is the alleged head of the Beltran Leyva drug cartel.

The 37-year-old Edgar Valdez Villarreal, known as the Barbie, was captured by federal police close to the border between the southern Mexican states of Morelos and Guerrero following a shootout, Xinhua news agency reported on Monday.

Violent clashes between government security forces and demonstrators continue unabated in the Indian-controlled Kashmir.

Several people have been wounded on Tuesday after police opened fire to disperse the protesters in the capital city of Srinagar, AFP reported.

The Bolivian President Evo Morales has called for concerted efforts of Iran, Venezuela and Bolivia to put an end to the unilateralism dominant in the world.

"People in the world are suffering from the unilateralism of big countries that have filled the markets with their products," Morales said in a meeting with Iranian Minister of Industries and Mines Ali Akbar Mehrabian on Monday.

A fresh wave of violence has hit the northeastern Mexico border state of Tamaulipas, where suspected drug traffickers have shot dead the mayor of a small town.

Marco Antonio Leal was killed by gunmen on Sunday, as he drove through his rural municipality of Hidalgo near the Gulf of Mexico, the local attorney-general's office said.

At least one person has been injured after two bombs went off near a morgue in the Mexican city of Reynosa where the bodies of 72 migrants massacred last week are being kept.

"They were two different bombs about a block apart. We're investigating. We don't know what types of devices were used," AFP quoted an official as saying on Sunday.