Cabinet okays cross-border action, but PM silent on whether attack is imminent.
Celtic, Karlstad, Sweden
A Turkish military official told Reuters news agency that around 100 special forces were also sent into northern Iraq.
Ankara had been under intense domestic pressure to act against PKK fighters.
Turkey has amassed up to 100,000 troops near the mountainous border, backed up by tanks, artillery and warplanes, for a possible strike into mainly Kurdish northern Iraq against PKK fighters.
Ankara has made many threats of military action but, under heavy US pressure, has so far shown restraint.
Washington fears a large-scale operation could destabilise the most stable part of Iraq and possibly the wider region.
Turkey’s parliament approved a resolution on October 17 giving the government the legal basis to order cross-border military operations if and when it deemed them necessary.