BEIRUT – NATO is ready to defend alliance member Turkey amid artillery and mortar exchanges with Syria, its top official said Tuesday, as Ankara sent additional fighter jets to reinforce an air base close to the Syria border where tensions have escalated dramatically over the past week. Turkey and Syria have exchanged fire across their common border since errant Syrian shells killed five Turkish civilians last week, sparking fears of a wider regional crisis. The comments by NATO Secretary-General Anders Fogh Rasmussen were the strongest show of support to Ankara since the firing began Wednesday — though the solidarity is largely symbolic. Turkey has sought NATO backing but not direct intervention and the alliance is thought to be reluctant to get involved military at a time when its main priority is the war in Afghanistan. Ahead of a meeting of NATO defense ministers in Brussels, Fogh Rasmussen backed Turkey's right to defend itself. “Obviously Turkey can rely on NATO solidarity,” he added. “We have all necessary plans in place to protect and defend Turkey if necessary.” “We hope that all parties involved (in the Syrian crisis) will show restraint and avoid an escalation of the crisis,” Fogh Rasmussen said. At least 25 additional F-16 fighter jets were deployed at Turkey's Diyarbakir air base in the southeast late Monday, Turkey's Dogan news agency said, quoting unidentified military sources. The military's chief of staff inspected troops along the border with Syria Tuesday. The reinforcement of the Diyarbakir base also bolsters Turkish forces along the volatile Iraqi border. Turkish jets struck Kurdish rebel targets in northern Iraq in two separate cross-border raids Sunday despite recent warnings from Baghdad against any military operations on its territory. Meanwhile, two Syrian rebels said that seven military and intelligence officers belonging to Syria's ruling Alawite minority have defected to Jordan. The rebels said they helped the seven cross into Jordan Monday, and that the highest-ranking figure among them was an army colonel. Defections by Alawites, who make up the backbone of Assad's regime, are relatively uncommon. Almost all the defections have been from Syria's Sunni majority, who dominate the rebellion. Three other Alawite intelligence officials came to Jordan three weeks ago, said the two rebels, who spoke on condition of anonymity for fear of reprisals. – AP