Exchange of fire has continued in two disputed border areas, after the ceasefire came into force, according to Thailand's military. Clashes have since continued on Tuesday morning, the military claims.
"Such actions represent a deliberate breach of the ceasefire and a serious breach of trust," said Thai Major General Vithai Laithomya in a statement.
Meetings along the border
Cambodia's Ministry of Defense, on the other hand, states that there have been no armed clashes in any regions.
After the ceasefire came into force, there has been no armed conflict on all front lines. The Cambodian leadership is firmly determined to implement the ceasefire, said a spokesperson for the Cambodian Foreign Ministry according to AP.
However, both Thailand and Cambodia state that meetings between regional commanders on both sides of the border will be held during the day, as part of the ceasefire agreement.
Thailand and Cambodia agreed on Monday on an "immediate and unconditional" ceasefire after mediation talks in Malaysia.
Return home
In the Cambodian city of Samraong, 20 kilometers from the border, the sound of explosions died down just before midnight, reports an AFP journalist.
People who were forced to flee due to the fighting, including in Surin Province in Thailand, have been able to return home.
At least 38 people have been killed in the violence since last week, according to authorities in both countries. Soldiers are among the dead, but the majority are reported to be civilians.