CHONGQING, China—In this industrial megacity where Bo Xilai was Communist Party chief until his ouster in March, many residents said they continue to support him after the announcement he is the target of a probe into "serious violations" and his wife, Gu Kailai, is a murder suspect.

The city of more than 30 million people continued to bustle on Wednesday, with no obvious signs of additional security, a day after authorities stripped Mr. Bo of his remaining party posts and...