Three people were injured on Monday night when an improvised explosive device detonated at a Moscow bus stop, TASS state news agency said.

Police in the Russian capital confirmed to AFP that "an explosion took place at a bus stop on Pokrovka Road," in the city center.

The husband and wife who killed 14 people in last week's shooting rampage in California were both radicalized and "for quite some time," the FBI official in charge of the investigation said Monday.

David Bowdich, the FBI's assistant director in charge of the Los Angeles field office, said investigators were still trying to determine how and by whom Syed Farook and his wife Tashfeen Malik were radicalized before the December 2 shooting.

A clear victory for Venezuela's opposition in weekend elections showed that voters had an "overwhelming desire for a change," U.S. Secretary of State John Kerry said Monday, calling for dialogue in the oil-rich, cash-poor country.

"The United States congratulates the people of Venezuela for making their voices heard in a peaceful and democratic way on election day," Kerry said in a statement.

Two former Islamic State jihadists, including a would-be suicide bomber, were sentenced to jail by a German court Monday on charges of involvement in a terrorist group.

Ayoub B., 27, was given four years and three months, while Ebrahim H. B., 26, was handed a conviction of three years.

The five men accused of plotting the September 11, 2001 attacks -- including the alleged mastermind -- are this week due back in U.S. military court, though their prospects for an actual trial remain elusive.

More than 14 years after al-Qaida hijackers seized four passenger jets and killed about 3,000 people in New York, at the Pentagon and in Pennsylvania, the "9/11 Five" who allegedly helped hatch the plot remain holed up in the U.S. military's prison at Guantanamo Bay in southeastern Cuba.

Work began in Austria on Monday on a fence at a crossing point used by migrants on the border with Slovenia, a first in Europe's Schengen zone, an AFP photographer said.

Workers were driving metal posts into the ground at Spielfeld in southern Austria ready to be connected by wire fencing, rolls of which were ready on the ground.

Turkey on Thursday summoned Russia's ambassador to Ankara over images of a Russian serviceman brandishing a rocket launcher as his warship navigated through Turkish waters, a foreign ministry official said.

Russian ambassador Andrey Karlov was summoned to the foreign ministry headquarters over the images published by the Turkish media on Sunday, the official told AFP, the latest escalation of tensions following Turkey's downing of a Russian warplane last month. 

Pietro Parolin, the most senior cardinal in the Vatican hierarchy, and two close associates of Pope Francis can be summoned to give evidence in a controversial trial of journalists and alleged whistleblowers, a judge ruled Monday.

Overruling objections from the Vatican prosecutor, the judge agreed to putting the Holy See's Secretary of State, Pietro Parolin, on the stand, as well as Francis confidantes Cardinal Santo Abril y Castello and Archbishop Konrad Krajewski.

A German passenger plane flying to the Egyptian Red Sea resort of Hurghada landed in Budapest on Monday after a bomb scare but no explosives were found, Hungarian police said.

German airline Condor said that the Airbus A321 from Berlin with 140 passengers and crew on board diverted to Budapest after an "unspecific warning given by telephone."

Cuba's President Raul Castro consoled his Venezuelan counterpart Nicolas Maduro Monday, following a historic election defeat which handed control of Congress to the opposition.

The Cuban leader expressed "admiration" for the "extraordinary battle" waged by Maduro, the handpicked successor of late president Hugo Chavez, who now will be forced to work with an opposition-dominated Congress.