(Yicai Global) April 20 -- Several cross-market indexes, such as the CSI 1000 and CSI 300, are reporting abnormally this morning, the Shanghai Stock Exchange said on Weibo.

The bourse is working with index compiler China Securities Index to investigate the issues, it added. Its quotation system currently shows that the CSI 300 has fallen 2.4 percent and CSI 1000 has soared 6 percent.

Editor: James Boynton