Heed danger signals

The three recent cases of bomb attacks police authorities cracked in Qamdo, Tibet autonomous region, along with several others in the wake of the March 14 riot in Lhasa, present a worrisome new pattern of security threats.

Though none of the blasts caused any serious damage, they are a warning sign that separatist activities in Tibetan-inhabited areas are taking a dramatic turn to violence. This calls for our highest vigilance.

In all three cases, on April 5, 8, and 15 respectively, as well as in the one targeted at a township government in Qamdo on March 23, the suspects were Tibetan Buddhist monks. This inevitably reminds people of some other bewildering facts since the early-spring unrest in Lhasa.