请翻译以下文字。
翻译内容：2 Die in Bus Blasts in Southwest China
BEIJING — Two public buses exploded during the Monday morning rush hour in the city of Kunming, killing at least two people and injuring 14 others in what the authorities described as deliberate attacks as China is tightening security nationwide and warning of possible terrorist threats in advance of next month’s Olympic Games.
The blasts struck at 7:05 and 8:10 a.m., state media reported. Public security officials in Kunming, the capital of Yunnan Province in southwestern China, provided no information about whether the explosions were coordinated, nor did the authorities say whether they were the work of terrorist groups or disgruntled individuals.
China has experienced a spate of riots and public protests as the country prepares for the Aug. 8 opening ceremonies of the Beijing Olympics.