The Week in Pictures: John Lewis' journey home and launch of a Mars rover

A horse drawn carriage takes Rep. John Lewis' casket over the Edmund Pettus Bridge during a memorial service in Selma, Ala., on July 26, 2020. Lewis, D-Ga., who carried the struggle against racial discrimination from Southern battlegrounds of the 1960s to the halls of Congress, died on July 17.

See more photos: From Selma to two capitols: Photos of John Lewis' final journey

Federal officers use chemical irritants and projectiles to disperse Black Lives Matter protesters near the Mark O. Hatfield United States Courthouse on July 24 in Portland.

Gov. Kate Brown said Wednesday that the federal government had agreed to withdraw its law enforcement officers from Portland, where violent protests have persisted for weeks — but the Department of Homeland Security indicated it would keep its officers on the ground for the time being.

Muslim pilgrims pray on top of Mountain of Mercy on the Plain of Arafat during the annual hajj pilgrimage near the holy city of Mecca on July 30.

Only about 1,000 pilgrims will be allowed to perform the pilgrimage this year due to COVID-19.

Medical workers treat a patient who is wearing a helmet-based ventilator in the COVID-19 intensive care unit at the United Memorial Medical Center on July 28 in Houston.

COVID-19 cases and hospitalizations have spiked since Texas reopened, pushing intensive-care units to full capacity and sparking concerns about a surge in fatalities as the virus spreads.

The Perseverance rover, designed to study the geology and climate of Mars, launches into orbit aboard an Atlas V rocket from Cape Canaveral Air Force Station on July 30. 

NASA said the mission and its subsequent discoveries could lay the groundwork for eventual human exploration of the Red Planet.

An immigration service officer swears in a new U.S. citizen at a drive-in naturalization ceremony in Santa Ana, Calif., on July 29.

The naturalization ceremony welcomed around 268 immigrants who took the citizenship oath and pledged allegiance to the American flag as the spread of the coronavirus continues.

People wearing face masks gather in a nightclub in Madrid on July 25.

On Thursday, Spain’s health ministry reported the biggest daily jump in new cases since the lockdown ended with more than 1,000 new infections for the second consecutive day.

Congressional staffers confer as Amazon CEO Jeff Bezos testifies via video conference during a hearing on Capitol Hill on July 29.

Members of Congress spend five and a half hours Wednesday grilling major tech CEOs about monopoly power on the internet.

A woman swims on a beach on the island of Chrysi, south of Crete, on July 26.

Michael Hermosillo of the Los Angeles Angels catches a fly ball hit by Robbie Grossman of the Oakland Athletics for the final out of their game in Oakland on July 25.

President Donald Trump points to a map of reported coronavirus cases during a news conference at the White House on July 23.

Protesters gather in front of the Mark O. Hatfield federal courthouse in downtown Portland on July 27.

As of Wednesday, at least 114 federal officers were known to be in the city, according to a court filing by the government.

A protester in front of the federal courthouse in Portland on July 27.

Attorney General William Barr testifies before the House Judiciary Committee in the Congressional Auditorium at the U.S. Capitol on July 28.

Democrats grilled Barr at a contentious daylong congressional hearing over the Justice Department's handling of politically sensitive cases, federal intervention in major cities during this summer's social unrest and President Donald Trump's mail-in voting conspiracy theories.

A U.S. military honor guard places Rep. John Lewis' casket at the center of the U.S. Capitol Rotunda to lie in state on July 27.

Ga Breedlove touches Lewis' casket lying in repose at the State Capitol in Atlanta on July 29.

Health officials test traffic police for COVID-19 in Kathmandu on July 29.

Registered Nurse Kath Olmstead gives volunteer trial participant Melissa Harting a blinded study experimental vaccine for COVID-19 developed by the National Institutes of Health and Moderna Inc. at the United Health Services facility in Binghamton, N.Y., on July 27.

The world's biggest COVID-19 vaccine study got underway Monday with the first of 30,000 planned volunteers helping to test shots created by the U.S. government — one of several candidates in the final stretch of the global vaccine race.

A rainbow and dark clouds form over Dortmund, Germany, on July 26.

Former President Barack Obama speaks during Lewis' funeral in Atlanta on July 30.

Obama gave a searing eulogy for Lewis, urging Americans to honor the legacy of a civil rights giant by engaging in the "good trouble" that leads to a more perfect democracy in the face of powerful institutions that seek to oppress.

See last week's gallery: The Week in Pictures: July 17-23