Some were allegedly found with their hands tied and stripped of their clothes, spokeswoman Ravina Shamdasani said
The BBC's political editor Laura Kuenssberg said senior ministers would hold a conference call on Wednesday morning.
Parliament returns on September 3 and had been expected to sit for two weeks before breaking up again to allow each national political party to hold their annual conference. Typically it begins sitting again in early October.
The BBC said Johnson would set an October 14 date for the Queen's Speech - the formal state opening of a new session of parliament at which Queen Elizabeth reads a speech prepared by the government, setting out a legislative agenda for the coming year.
A Queen's Speech on October 14 would delay parliament's return, and leave lawmakers with just over two weeks until Britain is due to leave the EU on October 31.
Some were allegedly found with their hands tied and stripped of their clothes, spokeswoman Ravina Shamdasani said
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