US President Joe Biden has ordered intelligence agencies to investigate the emergence of Covid-19, amid growing controversy about the virus's origins.
A gunman has opened fire in a commuter train yard in California, killing "multiple" people, police say.
Texas legislators have passed a bill which would allow most people to carry concealed handguns without a permit.
The Democratic-controlled US House of Representatives has voted, with Republican support, for a commission to investigate the Capitol riot.
The Biden administration has waived sanctions on a company building a controversial gas pipeline between Russia and Germany.
The New York attorney general's office says it is investigating the Trump Organization "in a criminal capacity".
Joe Biden has brought back a US presidential tradition by releasing his tax return, the White House said.
US Republicans have appointed New York Congresswoman Elise Stefanik, a Trump loyalist, to the third-ranking post in the House of Representatives.
President Joe Biden has hailed a "great day for America" as US officials said vaccinated people can go mask-less in most indoor and outdoor settings.
US Republicans are to vote on whether to oust one of their leaders, Liz Cheney, over her repeated criticism of former President Donald Trump.
Russia's unmanned Luna-25 spacecraft has crashed into the Moon after spinning out of control, officials say.
Donald Trump has confirmed that he will not take part in Republican presidential debates with his rivals in the race for the White House.