Stocks around the world swung on Tuesday, oil prices rose sharply and the price of nickel surged so much that trading for it was shut in London, as the economic fallout from Russia's invasion of Ukraine keeps rocking markets.

The S&P 500 was virtually flat in early trading after swinging between gains and losses, as gains for ExxonMobil and other oil companies benefiting from higher crude prices weighed against losses elsewhere.

Buses carried civilians out of one embattled Ukrainian city Tuesday and supplies toward another, as officials tried to rescue people away from a Russian onslaught and ease the dire humanitarian situation for those still stuck. But reports of renewed Russian attacks on the port of Mariupol threatened to again derail the efforts.

On the 13th day of the invasion, Europe's worst refugee crisis since World War II grew even more severe, with U.N. officials reporting that 2 million people have now fled Ukraine.

Libya's east-based army rounded up at least 50 people in a coastal city following a prison escape earlier this year, a rights group said Tuesday.

Human Rights Watch said in a statement that an armed group affiliated with the self-styled Libyan Arab Armed Forces launched the crackdown after five prisoners escaped from a prison in the city of Derna on Jan. 16.

Libya's national oil company said it resumed oil production Tuesday from the country's largest field three days after an armed group shut it down.

The state-run National Oil Corporation said pump valves at the Sharara field were opened a few minutes after midnight local time.

Israeli troops on Tuesday demolished the homes of two Palestinians accused of carrying out a deadly shooting attack in the occupied West Bank last year, the military said.

The residences of Mohammed Jaradat and Jit Jaradat in the West Bank were demolished early Tuesday, the military said. The men are accused of shooting at a car driving near the outpost of Homesh, killing a Jewish seminary student and wounding two others. The military said earlier the demolition took place late Monday.

President Joe Biden announced a ban on US imports of Russian oil on Tuesday, in the administration's most far-reaching action yet to punish Moscow for invading Ukraine.

"We're banning all imports of Russian oil and gas and energy. That means Russian oil will no longer be acceptable at US ports and the American people will deal another powerful blow to (President Vladimir) Putin," Biden said in an address from the White House, adding that the decision was taken "in close consultation" with allies.

In a neighborhood of Iraq's capital, a gigantic poster of Vladimir Putin with the words, "We support Russia," was up for few hours before a security force arrived and hurriedly took it down. Then came the security directive: All public displays of Putin's pictures shall be banned.

Such wrangling shows the deep divisions over the Ukraine war in the Middle East, where Moscow has embedded itself as a key player in recent years, making powerful friends among state and non-state actors while America's influence waned.

Wrangling over the Ukraine war has showed deep divisions in Lebanon and in the Middle East, where Moscow has embedded itself as a key player in recent years, making powerful friends among state and non-state actors while America's influence waned.

Hizbullah has railed against the government's condemnation of Russia's attack on Ukraine, calling for neutrality, after an unusually blunt Foreign Ministry statement caused an uproar and upset the Russians, forcing the minister to clarify that Lebanon did not intend to take sides and would remain neutral.

Barcelona has displayed its offensive depth, resorting to goal-hungry substitutes to salvage a victory and keep its momentum in the Spanish league.

Ferran Torres and Memphis Depay came off the bench to score second-half goals as Barcelona rallied to beat Elche 2-1 to continue its upward move in the standings.

U.K. lawmakers are set to pass a bill on Monday aimed at toughening sanctions on Russia and rooting out ill-gotten money from the British economy.

Prime Minister Boris Johnson said the Economic Crime Bill will let British authorities "pursue (Russian President Vladimir) Putin's allies in the U.K. with the full backing of the law, beyond doubt or legal challenge."