Ukrainian forces bombarded Russian positions in the occupied and illegally annexed southern Kherson region, targeting resupply routes across a major river while inching closer Friday to a full assault on one of the first urban areas Russia captured after invading the country.

Russian-installed officials were reported desperately trying to turn the city of Kherson, a prime objective for both sides because of its key industries and major river and sea port, into a fortress while attempting to evacuate tens of thousands of residents.

The Kremlin poured as many as 2,000 draftees into the Kherson region — one of four provinces Moscow illegally annexed and put under Russian martial law — to replenish losses and strengthen front-line units, according to the Ukrainian army's general staff.

• The U.S. Army's 101st Airborne is practicing for war with Russia just miles from Ukraine's border

The Dnieper River figures prominently in the regional battle because it serves critical functions — crossings for supplies, troops and civilians; drinking water for southern Ukraine and the annexed Crimean Peninsula; and power generation from a hydroelectric station. Much of the area, including the power station and a canal feeding water to Crimea, is under Russian control.

Kremlin-installed Kherson officials said Ukrainian shelling of a Dnieper River ferry crossing killed two journalists working for a local TV station they set up under occupation. At least two other people were reported killed and 13 wounded.

Natalia Humeniuk, a spokesperson for Ukraine's southern operational command, confirmed the Ukrainian military struck the Antonivskyi Bridge but only during an overnight curfew Russian-installed officials put in place to avoid civilian casualties.

"We do not attack civilians and settlements," Humeniuk told Ukrainian television.

Earlier Ukrainian strikes had made the Antonivskyi Bridge inoperable, prompting Russian authorities to set up ferry crossings and pontoon bridges to relocate civilians and transport supplies to Russian troops in Kherson, which sits on the Dnieper's western bank.

Russian-installed officials are trying to evacuate up to 60,000 people from Kherson for their safety and to allow the military to build fortifications. Ukraine's military reported Friday that bank employees, medical workers and teachers were relocating as the city's infrastructure wound down.

"The situation is really difficult," the deputy head of Kherson's Kremlin-installed regional administration, Kirill Stremousov, said in a video he posted on Telegram. "Today we are preparing the city of Kherson as a fortress for defense and are ready to defend to the last. Our task is to save people, build defenses and protect the city."