Labour leader Ed Miliband will address his party at the conference in Manchester later. Deputy leader Harriet Harman will also deliver a speech.
Yesterday Labour's leadership averted a head-on clash with unions over pay restraint and cuts.
A proposed union motion condemning the current pay freeze for public sector workers was watered down, avoiding the danger of defeat for leader Ed Miliband, who insists that preserving jobs must take priority over pay rises.
More top news
Greater Manchester Police said "inquiries are ongoing to fully understand the circumstances of the incident."
Business Secretary Greg Clark said talks with Peugeot's boss over a potential Vauxhall takeover were both "constructive and reassuring".
He served in Margaret Thatcher's Cabinet as Home Secretary in 1989 and was also a former Governor of Bermuda.