Two artillery shells from Myanmar on Thursday hit a small city in China, injuring five people, two months later another cross-border fire killed five Chinese citizens.
According to the state media, shells hit Lincang, a small city on the China-Myanmar border, also damaging houses and vehicles. The media reported one Chinese and four Myanmar citizens wounded, two of them in serious condition.
The relations of the two countries strained after a similar cross-border fire in March as Myanmar forces and Kokang rebels fighting intensify. China also reacted strongly when almost 60,0000 people crossed its border, escaping the fierce battle.
Rebels in northeastern Kokang has been fighting against the Myanmar government in last several months, despite ceasefire efforts.
Meanwhile, Myanmar's parliament has extended martial law for three months in Kokang region. The martial, which gives the military sweeping judicial and administrative powers, law was declared by President Thein Sein in February for three months.