(Reuters) - Executives from Alibaba Group Holdings Ltd's cloud division have been summoned by Shanghai authorities in connection with a theft of police data on Chinese citizens, the Wall Street Journal reported on Thursday. Based on scans of the police database, cybersecurity researchers concluded that the stolen data of nearly 1 billion Chinese citizens was hosted on Alibaba's cloud platform, according to the report. Alibaba did not immediately respond to a Reuters request for comment. Since the theft was discovered, Alibaba has temporarily disabled all access to the breached database and launched an inspection, the report said. (Reporting by Yuvraj...