"Around 11:30pm, these people got down, and the blasts happened 15 minutes later," Sharad Kumar, police inspector-general, told a news conference at Panipat, near the scene of the fire.
He said one of the men was around 35 or 36 years old, plumpish and dark, with a moustache. Kumar said the second was aged about 26 or 27, and wore a scarf around his head.
Both men were speaking the local Hindi language, he said.
"This is the statement of one of the eyewitnesses... On the basis of the witness we have made portraits of the suspects, of these two people," Kumar said.
On Monday, two bombs in suitcases exploded on the packed Samjhauta Express train connecting
The suitcases contained bottles of kerosene and petrol, mixed with cloth to prolong the blaze.
Two other bombs were planted on the train but failed to explode.
The attack appeared to be an attempt to undermine a peace process between the two countries.
Kumar said police were also questioning a Pakistani national whose name he gave as Usman Mohammed, who claims to have thrown one of the suitcases off the train.
"The suitcase was thrown on the track," he said. "Usman was there and said he had thrown it. We are verifying it. We are not giving a clean chit [bill]. He was drunk."
Both countries have condemned the attacks. Khursheed Mehmood Kasuri,
While the attack occurred in
There were 67 bodies at the mortuary in Panipat, many burnt beyond recognition. One other person died in a
About a dozen people were also injured in the attack.