Garda sources said there may have been five gang members or possibly more. They believe two were armed with sawn off shotguns and that at least oneof them had a handgun.
Garda said only "a small number of gangs" would be Nike Kyrie 2 Christmas capable of operating such a crime and that they would be looking at these people.
The culprits pulled in on the hard shoulder at around 7am and fled, escaping on foot across open ground.
They tied up Ms Corrigan, her husband, both aged in their early 50s, and her 26 year old son.
He said three of the men appeared to be aged in their 30s, while one was in his early 20s.
The area around the van and the house were sealed off for technical examination.
The men freed themselves and were picked up by a passing patrol car at 7.15am. Ms Corrigan was later found at her home unharmed but was deeply traumatised.
was given instructions to open the post office on Ballygall Road East and remove cash to secure their release.
Forensics hope to shed light on botched 'tiger' kidnaps
In yesterday's tiger kidnapping, a gang of at least four armed and masked men entered the home of postmistress Betty Corrigan at Glasnevin Avenue, Glasnevin, north Dublin, at around 1am.
A number of hours later, members of the gang took the son and her Nike Zoom Winflo 3 Shield Men's Running Shoes
They were masked at all times and wore gloves. Garda said they seemed to be "fairly organised" and had done an amount of preparatory work and knew the local area.
"The family were made aware why they were there. They were told to calm down and that if they behaved and did what they were told, they wouldn't be hurt," said a garda source.
to 8am yesterday or who saw a blue Citroen Berlingo van to contact them on 01 6667500 or the confidential line 1900 666 1111.
"The fact that, in both cases, the kidnappers suddenly left the vans means they may have left behind some forensic clues, such as fibres, fingerprints, etc," said one garda source.
Garda appealed to anyone who was near Glasnevin Avenue from midnight Nike Metcon 1 Blue
Garda said the van developed mechanical problems on the M50 southbound.
husband, hooded them, bound them and bundled them into the back of the gang's van and drove off.
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