KYIV — Ukraine President Zelensky has condemned a “deliberate” attack on Ukraine’s “peaceful” city of Kostyantynivka.

At least 16 people, including a child, were killed in the blast, which took place on a busy market street in the middle of the day — a rarity.

Kostyantynivka, in Ukraine’s eastern Donetsk region, is near the front line.

Videos on social media show a bright orange explosion at the far end of a street where people were out shopping. Russia is yet to comment on the attack.

Zelensky, who has blamed Moscow, said those killed were “people who did nothing wrong” — and warned the death toll could increase.

Dealing with Russia, he said, meant turning a blind eye to the audacity of evil.

At least 28 people are thought to be injured. A market, shops and a pharmacy are all reported to have been hit.

Police and rescue services are on the scene, still looking for survivors. It seems to be the worst attack of its kind for several months.

“All services are working,” Ukrainian Prime Minister Denys Shmyhal assured residents, adding: “The fire is contained.”

Footage circulating online appears to show the moment of the explosion and its graphic aftermath.

It took place in a busy street as people were flocking to market stalls and café terraces.

An investigation into the attack has been launched by Ukraine’s prosecutor-general, which said its office said was in pursuit of “criminal proceedings for violation of the laws and customs of war”.

“Prosecutors are taking all possible and appropriate measures to record war crimes committed by the Russian Federation,” a statement added.

Officials in Russia have not yet claimed responsibility for the attack. They have previously denied targeting citizens as part of their offensive.

Kostyantynivka sits close to the battlefield and has been hit on various occasions this year as a result:

#On 2 April: Six civilians were killed, with missiles and rockets damaging 16 apartment blocks and a nursery school

#On 13 May: Two people - including a 15-year-old old girl - were killed in an attack using Smerch rockets that hit high-rise buildings, houses, a petrol station, a pharmacy and shops

#On 24 July: Two children were killed in an attack, which Ukraine said Russian officials used cluster munitions to carry out

It is also about 17 miles (27km) from the city of Bakhmut, where fighting is known to have been intense for some time.

Ihor Klimenko, Ukraine’s interior minister, shared images on Telegram of what he said were rescue workers sifting through the rubble.

The city of Donetsk has been controlled by Russia’s proxy authorities since 2014, who have repeatedly accused Ukrainian forces of targeting it since the war with Russia began last February.

The attack on Wednesday coincided with a visit by US Secretary of State Antony Blinken to Ukraine’s capital, Kyiv, where he met Ukraine’s Foreign Affairs Minister Dmytro Kuleba.

In the hours before he arrived, sirens wailed across the country and Kyiv’s air defense system was busy intercepting missiles aimed at the capital.

It was assumed Blinken would announce a fresh US aid package for the war-torn country during his trip. — BBC