The blast occurred in a general coach of the train between 9.30 AM and 10 AM when it was on its way to Ujjain from Bhopal, Railway PRO, Indore, Jitendra Kumar Jayant said.
A bomb disposal squad has reached the accident site, which is around 81 km from Bhopal, and is trying to ascertain the cause and the nature of the blast.
"The ceiling of the coach was damaged in the blast but so far we have not found any explosive device or its remains from the spot," Superintendent of Police, GRP Indore, Krishnaveni Desavatu told PTI.
The PRO said that two coaches were damaged in the blast. They were separated from the train which later left for its onward journey.
More From This Section
The two seriously injured persons were referred to a hospital in Bhopal.The others were undergoing treatment at a hospital in Kalapipal town, which is close to the accident site.
Additional Director General of Police, Ujjain, Madhu Kumar and senior officials of Ratlam railway division have rushed to the accident site.
The exact cause of the blast will be known after examination of the affected coach, Kumar said.
The Jabdi station falls between Kalapipal and Sehore railway stations. Following the blast, the train came to a halt.
Smoke engulfed the general coach, causing panic among the passengers who rushed out to save themselves.
A relief train has been rushed to the mishap site, the PRO said.
The Railways have made available helpline numbers for those seeking information about their relatives in the train.
(Reopens BOM6)
The injured passengers were identified as - Bharti
Bharti and Athar were seriously injured the blast and referred to a hospital in Bhopal.