"Ayer, durante la noche, hubo un accidente en el centro de la ciudad que requirió atención médica urgente. La policía está manejando la situación y ha detenido al conductor por violación de tráfico."<br><br>english: "Yesterday, during the night, there was an accident in the city center that required emergency medical attention. The police are handling the situation and have arrested the driver for traffic violation."
 Your translation is accurate and conveys the original message effectively in English. If you're looking to enhance clarity or style while maintaining professionalism, consider this refined version:

"Yesterday evening, a serious incident occurred downtown necessitating urgent medical response. The authorities are currently managing the aftermath and have apprehended the driver for breaching traffic regulations."

This version incorporates slightly different phrasing to potentially enhance readability while keeping the original meaning intact.