An attack by Syrian government forces killed five Turkish soldiers in northwest Syria on Monday, threatening further escalation in the region after another deadly artillery strike last week.

Turkish defence officials said five other troops were wounded in "intense" shelling in Taftanaz in the northwestern province of Idlib, the last rebel-held stronghold in Syria.

Turkey immediately responded and "neutralised" more than 100 enemy targets, the defence ministry said in a statement.

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