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Turkey returns Syria mortar fire

Another mortar shell from Syria has struck Turkish territory, prompting a fourth straight day of retaliatory artillery fire, and reviving fears that the crisis in Syria could spiral into a regional conflict.

The latest shelling comes a day after Turkish prime minister Recep Tayyip Erdogan called on Syria not to test Turkey's "limits and determination" and insisted that his country "was not bluffing" with its warnings.

The mortar landed in a rural area near the village of Guvecci, just minutes after intense fighting broke out across the border in Syria's Idlib province, between Syrian rebels and the forces of president Bashar Assad's regime, the private Dogan news agency reported.

No one was hurt by the mortar, which landed some 50 yards inside Turkish soil and some 700 yards away from the village, said a statement from the office of the governor for Turkey's border province of Hatay. An army unit based near Guvecci promptly responded, firing four 81-mm mortars, it said.

The governor's office indicated that the Syrian mortar had landed in Turkey accidentally, saying it was believed "to be have been fired by the forces of the Syrian Arab Republic at Syrian rebel groups on the Syrian side of the border".

Villagers rushed out of homes and gathered at a safer point in the village, away from the border area, Dogan reported.

The latest tensions with Syria began on Wednesday when a Syrian shell hit a home at a Turkish border town, killing two women and three children and sparked unprecedented artillery strikes by Turkey.

Turkey's parliament on Thursday also voted to allow cross border military operations in Syria, further raising tensions between the neighbours that were once close allies.

On Friday, the United States sided with Turkey, condemning what White House spokesman Josh Earnest called the "aggressive actions of the Syrians." Earnest said Turkey's response was appropriate and that the US stands by Turkey, a Nato ally.

The latest shelling came as both sides appeared to be trying to defuse the situation. A Turkish Foreign Ministry official said Friday that Syria has pulled tanks and other military equipment away from the border.