Facebook on Wednesday banned ads on its flagship website and Instagram that claim widespread voting fraud, suggest US election results would be invalid, or which attack any method of voting.
The company announced the new rules in a blog post, adding to earlier restrictions on premature claims of election victory.
The move came a day after US President Donald Trump used the first televised debate with Democratic challenger Joe Biden to amplify his baseless claims that the November 3 presidential election will be "rigged".
Trump has been especially critical of mail-in ballots, and he cited a number of small unrelated incidents to argue that fraud was already happening at scale.
Facebook has been under fire for refusing to fact-check political ads more broadly and for rampant organic misinformation.
Citing hate speech rules, it also moved Wednesday to remove Trump campaign ads suggesting that immigrants could be a significant source of coronavirus infections.
Facebook said the new election ad prohibition would include those that "portray voting or census participation as useless/meaningless" or that "delegitimize any lawful method or process of voting or voting tabulation... as illegal, inherently fraudulent or corrupt".
Israel bombarded northern Gaza overnight in some of the heaviest shelling in weeks, causing panic amongst residents and flattening neighbourhoods in an area from which the Israeli army had previously down its troops, residents said on Tuesday.
Russia launched a drone attack on Ukraine that injured seven people in the Black Sea port of Odesa, two of them children, and also targeted Kyiv, the capital, Ukraine's military officials said early on Tuesday.
A Delhi court on Tuesday extended the pre-trial detention of Indian opposition leader Arvind Kejriwal until May 7 in a corruption case, the legal news website Live Law reported.
Taiwan's quake-hit eastern county of Hualien was rattled by more than 200 aftershocks late on Monday and early on Tuesday, but only minor damage was reported and no casualties and major chipmaker TSMC said it saw no impact on operations.
Two Malaysian navy helicopters collided in mid-air during a rehearsal for a naval parade on Tuesday, killing all 10 crew members aboard, the navy said in a statement.
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