BANGKOK — Thailand threatened Monday to suspend a U.S.-brokered ceasefire with Cambodia after a land mine explosion along their volatile border injured four Thai soldiers.

Thailand and Cambodia signed the truce agreement last month after territorial disputes between the Southeast Asian neighbors led to five days of combat in late July that killed dozens of soldiers and civilians.

Tensions have simmered and other land mine explosions before and after the clashes have also caused injuries.

The Royal Thai Army said late Monday that the explosion earlier in the day injured four soldiers. A sergeant lost his right foot after stepping on a land mine while on patrol along the border in Sisaket province, while the other three suffered minor injuries from shrapnel or the impact of the blas

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