Yassin Salhi, 35, was arrested after driving his van into a warehouse containing dangerous gases near France's second city of Lyon. Authorities then found the severed head nearby.
The "selfie" picture was sent via the WhatsApp messaging system to a number in North America, said the source close to the investigation. However, it was not possible to fix the location of Salhi's contact, the source added.
Read: One beheaded, several hurt in France terror attack
Yassin Salhi launched a daylight raid on a gas factory in eastern France on June 26, pinning a decapitated head to the gates and injuring at least two others with explosive devices.
“The intent was without doubt to cause an explosion. It was a terrorist attack,” said President Francois Hollande in Brussels, cutting short an EU summit to hold emergency meetings in the French capital.
The 35-year-old attacker, identified as Yassin Salhi, had been known to security services for a number of years but did not have a criminal record, Interior Minister Bernard Cazeneuve said. He was taken into custody and an anti-terrorist probe has been launched, Cazeneuve added.
The suspect’s wife has been taken into police custody, a legal source said. Police are currently also holding another person who was seen driving up and down the gas site in a suspicious manner but has not been formally linked to the attack.
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