A spokesman for Russian President Vladimir Putin says customs officials are scrutinizing Turkish goods at the border due to "various reasons" including a possible terrorist threat.

Relations between the two countries soured after Turkey on Tuesday shot down a Russian warplane on a bombing mission near the Syria border. One of the pilots was killed, the other was rescued.

Russian media reported hundreds of trucks bringing Turkish goods stranded at the border.

Dmitry Peskov insisted on Thursday that there is no ban for Turkish goods in place but said customs officials were inspecting them carefully "due to various reasons" including a possible terrorist.

Last year, Russia imposed a ban on food imports from the U.S. and EU nations in retaliation for their sanctions over Russia's annexation of Crimea.