By Helen Regan, Kocha Olarn, Lauren Kent, Olivia Kemp, CNN

(CNN) — Armed clashes on the remote, disputed border between Cambodia and Thailand killed at least 12 people on Thursday, in a dramatic escalation of tensions that threatens to erupt into a broader conflict.

Both sides’ forces accuse each other of opening fire Thursday morning. Cambodia then fired rockets on Thai soil, Thailand said, to which it responded with mortars. A Thai fighter jet later dropped two bombs near the road leading to a temple in Cambodian territory, Cambodia said.

The violence comes a day after a Thai soldier lost his leg in a landmine explosion, an incident that cratered relations between Bangkok and Phnom Penh to their lowest level in years. Thailand has since closed all border crossings with Cambodia.

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