A股三大股指午后走弱，沪指跌幅扩大至1%，深证成指跌超2%，创业板指跌2.58%。

Group 1 - The three major A-share indices weakened in the afternoon, with the Shanghai Composite Index's decline expanding to 1% [1] - The Shenzhen Component Index fell over 2% [1] - The ChiNext Index dropped by 2.58% [1]