An explosion at a highway construction site in Romania early on September 21 killed four people and injured five, emergency services said. The blast happened around 1 a.m. local time near the town of Calimanesti, 100 kilometers northeast of the capital, Bucharest. A spokesperson for emergency services said the explosion was caused by the "cracking of a gas transport main and appearance of mechanical sparks" during construction work. Investigators are looking into the causes of the blast. Representatives of operator Transgaz say the pipeline builder did not comply with a specialist opinion issued in 2021. To read the original story by RFE/RL’s Romanian Service, click here.