ANKARA, JULY 9 -- Kurdish rebels killed 27 villagers -- 11 of them children -- in attacks in southeastern Turkey last night and today.

Prime Minister Turgut Ozal announced new security measures at a news conference in Diyarbakir after touring two villages attacked by separatist rebels. Ozal said a new coordinating governor with his own military police and intelligence units would oversee security in the area.

The measure, to take effect when martial law in southeastern Turkey ends July 19, was decided on before last night's attacks, in which 16 persons were killed in Pecenek and nine in Yuvali, both in Mardin Province.

Two others died today outside Yuvali when a minibus bringing grieving relatives hit a mine left by the guerrillas, state television said.

All nine killed in Yuvali were relatives of headman Kadri Dag, who told the semiofficial Anatolian news agency the attack began when a child opened the door to a rebel dressed as a soldier.

"As the child fled, the bandit fired on him and then went up to the roof and sprayed the villagers with fire as they slept. When we fired back they fled. I saw others surrounding the village," he said.

Three weeks ago, the massacre of 30 people at Pinarcik village, in the same province, prompted Ozal to order an inquiry by the military into how to tackle the insurgency.