According to officials, two passenger trains crashed in Pakistan's southern Sindh Province on Monday, killing at least 30 people and wounding 50 more.
According to a Pakistan Railways spokeswoman, the accident occurred when the Millat Express train from Karachi to Sargodha derailed and landed on the other track, colliding with the Sir Syed Express train from Rawalpindi to Karachi.
The incident occurred in Dharki, a city in upper Sindh's Ghotki district, in which the Millat Express train's bogies toppled.
Ghotki, Dharki, Obaro, and Mirpur Mathelo hospitals have declared an emergency.
According to Ghotki Deputy Commissioner Usman Abdullah, at least 30 persons were killed and 50 more were injured in the incident.
Officials were also having problems retrieving those trapped inside the bogies that had toppled.
The deputy commissioner told Geo News that 13 to 14 bogies were derailed in the accident, with six to eight being "totally wrecked."
Rescue workers are facing a "difficult" in rescuing passengers who are still stranded, he added, adding that a relief train has left Rohri.
"This is a difficult task. Using heavy machines to release citizens will take time (still trapped). He added, "We are also constructing a medical camp to provide medical assistance to citizens."
Passengers were stranded in one of the bogies, according to Ghotki Senior Superintendent of Police Umar Tufail, and "we dread additional casualties."
"Shocked by the horrible train disaster at Ghotki early this morning that claimed the lives of 30 people," Prime Minister Imran Khan said on Twitter, adding that he was ordered a thorough probe into the issue of railway safety.
Over 1,000 passengers were on board the two trains, according to officials.
Officials from the fire department and the Red Cross were dispatched to the scene.
Meanwhile, the accident is the subject of an investigation.
In Pakistan, train accidents are widespread, and scores of people are killed each year. Due to bribery, incompetence, and a lack of investment, the railways have been in decline for decades.