Officers with the Swedish police force are checking passports and other identification documents of travelers crossing into Sweden from Denmark and Germany.
Officials say some 30 to 50 refugees and migrants were turned back after not having proper ID or the right to enter Sweden.
Police also say between 500 and 600 people have sought asylum in Sweden since the introduction of the temporary border controls. The Migration Agency says 1,600 have sought asylum in Sweden, in the past 24 hours.
At Hyllie station, a railway station south of central Malmö and the first stop after the Danish border, reporters saw police checking nearly every passenger for identification and escorting those without off the train.
Several of them were upset and crying when they learned what was happening but no altercations broke out.
"I must say that I'm surprised that this is such a calm border control even though it's very intense," Swedish Radio News reporter Claes Aronsson says.
Aronsson says most Malmö residents were prepared for the random checks and took them in stride. He says though if the checks continue for longer than their 10-day time frame attitudes among residents, police and refugees may change.