Tens of thousands of demonstrators marched through Mexico City Saturday against the presidential election win of Enrique Pena Nieto, accusing him and his party of widespread vote-buying.

The marchers claim Pena Nieto, from the Institutional Revolutionary Party (PRI), "bought" his way to victory by handing out gift cards and securing paid favorable media coverage from the country's two main TV networks.

The gravestones of 40 German soldiers from World War I have been desecrated at a military cemetery in the Ardennes region of northern France, the interior ministry said Saturday.

The announcement came on the eve of the 50th anniversary of renewed Franco-German relations after World War II.

The death toll from severe flash floods in Russia's southern Krasnodar region climbed to 150 people from the figure of 146 released earlier by investigators, a police spokeswoman said Sunday.

The worst hit area was an area around Krymsk, a town of 57,000 lying about 200 kilometers (120 miles) northwest of the Black Sea resort town of Sochi where Russia will host the 2014 Summer Olympic Games.

A scorching heat wave searing the United States was expected to ease soon, meteorologists said Saturday, heralding relief from record highs blamed for deaths and drought-like conditions.

Across the country, at least two dozen fatalities are tied to the extreme period of hot weather, one of the longest and hottest on record, according to media reports.

French President Francois Hollande confirmed Saturday plans for a new law criminalizing denial of the Armenian genocide with representatives of the Armenian community, the Elysee Palace confirmed.

"The president expressed his commitments during the campaign. He will keep them," an Elysee Palace official told Agence France Presse, confirming a telephone conversation Hollande had had with an Armenian community leader.

A former al-Qaida leader extradited to Mauritania in April after being arrested in Iran in 2002 has been released from custody, his family said Saturday.

Mahfoud Ould Waled was freed Thursday, a family member told Agence France Presse.

Gunmen killed several people in an attack on two Christian villages in central Nigeria's Plateau State early Saturday, officials said.

Although police and army spokesman could not give an exact toll, one politician said at least 23 people had been killed and blamed Muslim herdsmen for the attacks.

U.S. Secretary of State Hillary Clinton arrived in Tokyo Saturday ahead of a major development conference for Afghanistan where donors are expected to pledge billions of dollars in support.

Clinton touched down in the Japanese capital after a brief visit to Kabul where she announced that the United States had designated Afghanistan as a major non-NATO ally, providing a long-term framework for defense cooperation.

The death toll from heavy monsoon rains which have caused massive flooding in India's northeast has risen to more than 120, with six million forced to flee their homes, officials said Saturday.

The weather office forecast that more rains during the next 24 hours would lash the region, which is suffering from its worst flooding in recent years.

Nigerian troops killed one person during a raid on a suspected hideout of Islamist group Boko Haram in the restive northeastern city of Damaturu, a hospital source and residents said Saturday.

Explosions and gunfire rocked the city, the capital of Yobe State on Friday, in the latest clampdown by the military Joint Task Force (JTF) on members of the sect, they said.