KYIV, Ukraine (AP) — Associated Press journalists around Ukraine and beyond are documenting military activity during Russia's invasion. With disinformation rife and social media amplifying military claims and counterclaims, determining exactly what is happening is difficult. Here's a look at what could be confirmed Friday.

Activity with direct witnesses:

-- Explosions heard from central Kyiv, about 800 meters (half a mile) from the president's headquarters.

-- Multistory apartment building in Kyiv hit by shelling, with major damage, on the eastern side of the Dneiper River that cuts through the capital, 13 kilometers (8 miles) southeast of the government quarter.

— Shooting near a main thoroughfare leading into central Kyiv from the south.

— Ukrainian soldiers evacuating an unmarked military vehicle damaged by gunfire in Kyiv, in the Obolon district about 10 kilometers (6 miles) north of the government quarter.

— Ukrainian military establishing defensive positions at bridges around Kyiv. Armored personnel carriers driving through Kyiv streets. Ukrainian authorities placed snowplows at some spots along Kyiv roads to force traffic to slow down.

— Russian missile launcher seen on the edge of the northeastern city of Kharkiv, shelling heard in the distance.

— A bridge destroyed at Ivankiv, some 60 kilometers (40 miles) northwest of Kyiv.

Announced by Ukrainian and Russian authorities, and others:

— A senior American intelligence official with direct knowledge of conditions on the ground in Ukraine says the capitol city of Kyiv was under missile bombardment late Friday night. The official, who spoke on condition of anonymity, had no immediate information on what targets might have been hit.

— Ukraine's nuclear energy regulator said higher than usual gamma radiation levels have been detected in the area around the Chernobyl nuclear plant, site of the world's worst nuclear accident, after it was seized by the Russian military. The International Atomic Energy Agency said the reported levels don't pose any danger to the public. The Russian Defense Ministry said radiation levels in the area have remained normal.

— Kyiv Mayor Vitaly Klitschko said gunfire and explosions in several parts of the city came as Ukrainian troops were fighting groups of Russian saboteurs. He also said five explosions hit an area near a major power plant on the city's eastern outskirts. No electricity outages were immediately reported.

— U.K. Defense Intelligence Chief Sir Jim Hockenhull says Russia launched a series of strikes on targets in Kyiv overnight and that multiple rocket launchers have been employed in Chernihiv and Kharkiv.

— Ukrainian President Volodymyr Zelenskyy said that 137 "heroes," including 10 military officers, had been killed. The Ukrainian military said it has killed over 1,000 Russian troops while fending off Moscow's invasion. The Russian military hasn't reported any casualties during the attack. Neither claim could be independently verified.

— The U.N. High Commissioner for Human Rights said its staffers have so far verified at least 127 civilian casualties, 25 people killed and 102 injured, mostly from shelling and airstrikes.

— The Russian military said it took control of an airport outside the Ukrainian capital. The airport in Hostomel, a town 7 kilometers (4 miles) from Kyiv, has a runway long enough to receive all types of aircraft, including the biggest cargo planes. Its seizure allows Russia to airlift troops directly to Kyiv's outskirts.

— The Russian Defense Ministry said its forces sealed the cities of Sumy and Konotop in northeastern Ukraine. It said they have knocked out 211 military infrastructure facilities. The claims couldn't be independently confirmed.

— The mayor said a school building was hit by a Ukrainian shell in the rebel-held city of Horlivka in eastern Ukraine, killing its headteacher and a teacher; rebels who hold Donetsk said the city's main hospital was damaged by shelling but there were no casualties.

— Moldova's national naval agency said a Moldovan-flagged ship was hit by a missile in "neutral waters" in the Black Sea, leaving two crew members seriously injured.

— A U.S. defense official said a Russian amphibious assault was underway, and thousands of Russian naval infantry were moving ashore from the Sea of Azov, west of Mariupol. The official said Ukrainian air defenses have been degraded but are still operating, and that about a third of the combat power that Russia massed around Ukraine is now in the country.

— British Intelligence Chief Sir Jim Hockenhull says Russia launched a series of strikes on targets in Kyiv overnight and that multiple rocket launchers have been employed in Chernihiv and Kharkiv.

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Follow AP's coverage of the Ukraine crisis at https://apnews.com/hub/russia-ukraine