A second man has been charged over the alleged stabbing murders of two French students, London police said Saturday.

The city's Metropolitan Police said Daniel Sonnex, 23, will appear before a court on Monday on two charges of murder.

Sonnex, from London, is the second person be to charged in the deaths of students Gabriel Ferez and Laurent Bonomo, who were both 23.

Bonomo was found with 200 stab wounds and Ferez with 50 wounds at Bonomo's London apartment on June 29. Their bodies had been doused in fuel and set on fire, police said.

The students were in the second year of a three-year Master's degree in bioengineering in France and had been selected to take part in a three-month research project into DNA at London's Imperial College. They were within weeks of returning home.

Bonomo and Ferez studied at the Clermont-Ferrand Polytechnical School in southern France.

Nigel Farmer, a 33-year-old unemployed man, also has been charged on two counts of murder over the deaths.