LONDON (AP) -- Lawyers for Britain and Spain contend that international law leaves the House of Lords no choice but to uphold the arrest of former Chilean dictator Gen. Augusto Pinochet on charges of human rights violations.

The 83-year-old general was arrested Oct. 16 in London on a Spanish warrant alleging he ordered murders, kidnapping and torture -- including the death of Spaniards -- during his 1973-1990 rule.An official government report says 3,197 people were killed or disappeared at the hands of his secret police after Pinochet overthrew elected Marxist Salvador Allende.

The lawyers for Spain and Britain argued Tuesday, the second day of a hearing before Britain's highest court, that international conventions deny heads of state any special protection or immunity if the crimes alleged are significantly grievous.

"We submit that in some circumstances there is an actual duty not to accord immunity," lawyer Christopher Greenwood said.

He cited the Nuremberg trials of World War II Nazi leaders and the more recent international tribunals trying Bosnia Serbs.

The House of Lords is being asked to decide again whether the aging general's arrest can stand, therefore allowing the extradition request against him to proceed.