Rescuers are seen at the blast site of a plant in Moscow region, Russia, Aug. 9, 2023. Forty-three people have been injured so far in a blast at an optical-mechanical plant in the city of Sergiev Posad in the Moscow region on Wednesday, local authorities said. The explosion happened on Wednesday morning at around 10:40 a.m. local time (0740 GMT) at a pyrotechnics warehouse, which was being rented out on the optical-mechanical plant's territory by a private company, said Governor of the Moscow Region Andrei Vorobiev in a Telegram post. (Xinhua/Bai Xueqi)

MOSCOW, Aug. 9 (Xinhua) -- Forty-three people have been injured so far in a blast at an optical-mechanical plant in the city of Sergiev Posad in the Moscow region on Wednesday, local authorities said.

The explosion happened on Wednesday morning at around 10:40 a.m. local time (0740 GMT) at a pyrotechnics warehouse, which was being rented out on the optical-mechanical plant's territory by a private company, said Governor of the Moscow Region Andrei Vorobiev in a Telegram post.

Among the injured, five are currently in critical condition, according to preliminary information provided by local authorities. Moreover, five people could still be trapped in the rubble.

Vorobiev said people have been evacuated from all the buildings and workshops of the plant, as well as from a kindergarten close to the factory. He also said that a sport complex near the plant had been damaged, as well as windows in nearby residential buildings.

Local media, citing a State Duma deputy, suggested that the blast could have occurred due to a "violation of technological processes."

In response, Russia's Investigative Committee has initiated a criminal case into the incident.

An ambulance leaves the blast site of a plant in Moscow region, Russia, Aug. 9, 2023. Forty-three people have been injured so far in a blast at an optical-mechanical plant in the city of Sergiev Posad in the Moscow region on Wednesday, local authorities said. The explosion happened on Wednesday morning at around 10:40 a.m. local time (0740 GMT) at a pyrotechnics warehouse, which was being rented out on the optical-mechanical plant's territory by a private company, said Governor of the Moscow Region Andrei Vorobiev in a Telegram post. (Xinhua/Bai Xueqi)

Rescuers and vehicles are seen at the blast site of a plant in Moscow region, Russia, Aug. 9, 2023. Forty-three people have been injured so far in a blast at an optical-mechanical plant in the city of Sergiev Posad in the Moscow region on Wednesday, local authorities said. The explosion happened on Wednesday morning at around 10:40 a.m. local time (0740 GMT) at a pyrotechnics warehouse, which was being rented out on the optical-mechanical plant's territory by a private company, said Governor of the Moscow Region Andrei Vorobiev in a Telegram post. (Xinhua/Bai Xueqi)

Rescue vehicles arrive at the blast site of a plant in Moscow region, Russia, Aug. 9, 2023. Forty-three people have been injured so far in a blast at an optical-mechanical plant in the city of Sergiev Posad in the Moscow region on Wednesday, local authorities said. The explosion happened on Wednesday morning at around 10:40 a.m. local time (0740 GMT) at a pyrotechnics warehouse, which was being rented out on the optical-mechanical plant's territory by a private company, said Governor of the Moscow Region Andrei Vorobiev in a Telegram post. (Xinhua/Bai Xueqi)

Ambulances leave the blast site of a plant in Moscow region, Russia, Aug. 9, 2023. Forty-three people have been injured so far in a blast at an optical-mechanical plant in the city of Sergiev Posad in the Moscow region on Wednesday, local authorities said. The explosion happened on Wednesday morning at around 10:40 a.m. local time (0740 GMT) at a pyrotechnics warehouse, which was being rented out on the optical-mechanical plant's territory by a private company, said Governor of the Moscow Region Andrei Vorobiev in a Telegram post. (Xinhua/Bai Xueqi)

Rescuers arrive at the blast site of a plant in Moscow region, Russia, Aug. 9, 2023. Forty-three people have been injured so far in a blast at an optical-mechanical plant in the city of Sergiev Posad in the Moscow region on Wednesday, local authorities said. The explosion happened on Wednesday morning at around 10:40 a.m. local time (0740 GMT) at a pyrotechnics warehouse, which was being rented out on the optical-mechanical plant's territory by a private company, said Governor of the Moscow Region Andrei Vorobiev in a Telegram post. (Xinhua/Bai Xueqi)

A rescue vehicle arrives at the blast site of a plant in Moscow region, Russia, Aug. 9, 2023. Forty-three people have been injured so far in a blast at an optical-mechanical plant in the city of Sergiev Posad in the Moscow region on Wednesday, local authorities said. (Xinhua/Bai Xueqi)

A staff worker clears broken glass at the blast site of a plant in Moscow region, Russia, Aug. 9, 2023. Forty-three people have been injured so far in a blast at an optical-mechanical plant in the city of Sergiev Posad in the Moscow region on Wednesday, local authorities said. (Xinhua/Bai Xueqi)