A man sits by the wreckage of a train accident in Wenzhou in east China's Zhejiang province on July 24. (AP)

The State Administration of Work Safety will present a report on the July 23 crash to China’s top leaders in September, the agency’s spokesman Huang Yi said in comments Tuesday on its Web site.

“Of course, a period of analysis is required to determine both the direct and indirect factors behind the crash and to work out who is responsible,” Huang said.

The monthlong inspections of 49 projects and 3,700 miles of bullet train lines and projects will run through the middle of September, and train operations and construction will be suspended if safety problems are found, officials say.

In the crash last month near the city of Wenzhou in eastern China’s Zhejiang province, a lightning strike caused one bullet train to stall and a sensor failure that allowed a second train to keep moving on the same track and slam into it.

The accident also prompted the railways authorities to order safety checks of all the country’s train lines.

Huang said it was clear that there were deficiencies in the safety management of the system.

“This was an accident that was both avoidable and preventable,” he said.

The bullet train collision killed 40 people and injured 177, including a toddler orphaned by the crash who was rescued nearly a day later.

China has 13 high-speed railways in operation, with 26 under construction and 23 more planned, although approvals of new projects were frozen following the Wenzhou crash.

The government has ordered reduced speeds and cut ticket prices for the lines.