Emergency doctors said today most were suffering from carbon-monoxide poisoning and some were unconscious. Doctor Maja Grba Buljevic told the Hina news agency their condition has improved.
Croatia's state TV says a total of 62 people, including children, were in the van when it was stopped late Saturday by traffic police on a road near the town of Novska, by the Bosnian border.
The report says all the migrants were male, from Afghanistan and Pakistan, and smuggled illegally into the country. It says a police statement is expected later today.