The benchmark Hang Seng index tumbled 2.9%, while Hong Kong's tech shares dived 4.6%. (EPA Images pic)HONG KONG: Hong Kong stocks slumped four-month lows on Thursday, while mainland blue chips edged closer to a technical bear market, as a selloff in tech shares and fading expectations for fresh stimulus to shore up China's economy dented investor sentiment.

In Hong Kong, the benchmark Hang Seng index tumbled 2.9%, while the city's tech shares dived 4.6%.

In the mainland market, the blue-chip CSI300 index lost 1.3% at the midday break, leaving it nearly 20% below its June peak. The benchmark Shanghai composite index dropped 0.9%.

The 20% threshold from a recent peak is widely defined as marking a technical bear market.