"The operation in Afrin started at 11:05 local time [08:05 GMT]," Yildirim was quoted as saying by the broadcaster.
Everyone, who tried to support Kurds in Afrin, would become targets of the Turkish Air Force too, the minister said, adding that a 30-kilometer safe zone would be created during the operation of the Turkish military.
According to Yildirim, Ankara maintains contacts with Damascus over its operation in Afrin through Russia's mediation.
"We are communicating with the Syrian government through Moscow's mediation. The Free Syrian Army together with our units has entered Afrin. Russia has no objections regarding the operation. Iran's concerns are now being settled," Yildirim was quoted as saying by the broadcaster.
The minister further noted that two people were injured as result of a shelling of Turkish city of Kilis by Syrian Kurds.
Earlier today, NTV broadcaster reported that Turkish tanks entered Syrian Afrin, backing the offensive of the Free Syrian Army (FSA) armed opposition group on the positions of Kurdish militia.