Two passenger trains have collided in Thailand injuring more than 20 people and possibly causing fatalities . Images of the twisted metal from the disaster in Ayutthaya province began to emerge on social media earlier today , amid police reports that one of the train drivers is in a critical condition . Authorities still do not know what caused the wreck just north of the country 's capital Bangkok but revealed that one train crashed into the back of another one . Scroll down for video . Disaster : Pictures emerged showing the twisted metal of two trains that collided in Thailand injuring at least 20 people . Tragedy : Images of the twisted metal from the carriages began to emerge on social media today , with report that 'many ' had been killed . Twisted metal : This is the third major transport accident to occur in Thailand this month after a truck collided with a train on Friday . Rescue operation : Firemen and rescuers traversed the wreckage to look for survivors amid reports that there were fatalities in the crash . Critical : A local police officer said most of the injuries were minor but at least two people were in a critical condition . A local police officer has said 22 people are believed to be injured , but that number is expected to grow . Nateepat Thammaratsophon said most of the injuries were minor but the train 's driver and a mechanic were in a critical condition . Most of the passengers on board managed to climb out of the demolished carriages and left the site on another train provided by the state-owned railway company . Images from the site show rescue workers climbing in and out of the mangled wreckage as they look for survivors . Mr Thammaratsophon said both trains departed Bangkok and were headed north when one rear-ended , adding : 'We are still investigation the cause of the collision . ' The accident was the latest to hit Thailand 's transportation industry after a pick-up truck driver crashed his vehicle into a passing train on Friday . And in another incident on Tuesday , a Bangkok-bound passenger train collided with another truck during heavy rains near the northern city of Chiang Mai , killing seven construction workers . Eyewitness Jeerawat Sukhanont tweeted from the scene : 'Urgent ! ! Now passenger train collision happened 2 sub-station ... has killed and wounded many . ' Desperate : Most of the people on board the trains managed to climb out through the twisted metal . Emergency : But the driver of one of the trains and a mechanic are believed to be in a critical condition following the horrific accident . Terrifying : Eyewitness Jeerawat Sukhanont tweeted from the scene : 'Urgent ! ! Now passenger train collision happened 2 sub-station ... has killed and wounded many ' Casualties : A local police officer has said 22 people are believed to be injured , but that number is expected to grow .
A transport train crashed into the back of another near Bangkok 's capital . The cause is still unknown but at least 22 people were injured in disaster . Train driver and a mechanic are in a critical condition , police officer said . Images show rescue workers looking for survivors in destroyed carriages . Third major transport accident in the country this month has 'killed many '