Russia has attacked a hospital in Sumy in north-eastern Ukraine early on Saturday, local time, killing 10 people and injuring at least 22 others, Ukrainian officials say.

Head of the UN Human Rights Monitoring Mission in Ukraine Danielle Bell said "loitering munitions" — or suicide drones — hit the Saint Panteleimon Clinical Hospital in two attacks 45 minutes apart.

"Most of the fatalities occurred during the second strike, which hit as first responders arrived at the site and patients attempted to evacuate," she said.

Sumy's regional administration said late on Saturday that 10 people had been killed and 22 injured, including 15 who were in hospital, five of them in serious condition.

All the hospital's patients were evacuated to other facilities, it added.

Sumy City Council said on its website that nine high-rise buildings were damaged in addition to the hospital.

Ms Bell said she had been in Sumy last week following up on a deadly attack on September 19 on a geriatric centre in which at least one civilian had been killed and 13 injured, and recalled an August 13 attack on another hospital complex in the city.

"Medical facilities are protected under international humanitarian law and are entitled to special protection. They must not be the object of attack," she said, adding that 33 civilians had been killed and 132 injured in Sumy city and the surrounding region since August 6.

Ukrainian prosecutors said that at the time of the Saturday morning attacks, 86 patients and 38 staff members were in the hospital.

The hospital shared a photograph on its Facebook page, where it said one of those killed was a nurse and mother of two daughters named Tatiana Tikhonova.

"The first attack killed one person and damaged the ceilings of several floors of the hospital," Interior Minister Ihor Klymenko said on Telegram.

"Everyone in the world who talks about this war should pay attention to where Russia is hitting. They are fighting hospitals, civilian objects and people's lives," Ukrainian President Volodymyr Zelenskyy said on Telegram.

"Only force can force Russia to peace. Peace through force is the only right way."

Mr Klymenko did not specify what weapons were used in Saturday's attacks. The regional administration and air forces said the strike was carried out by drones, which Ms Bell identified as loitering munitions.

Attacks on Sumy city and the Sumy region have become more frequent since Ukrainian forces launched an operation in Russia's Kursk region in August and captured dozens of settlements.

Sumy city is located just 32 kilometres from the Russian border and Russian forces, which began a full-scale invasion of Ukraine in February 2022, have been attacking the region and the city with drones and guided bombs.

Reuters