Brussels will remain on the highest alert level, Belgium's prime minister has said.
Speaking at a news conference, Charles Michel said the security lockdown in the Belgium capital would remain in place.
Schools and the metro system are to reopen on Wednesday.
Andy Murray says Great Britain's tennis players feel "very comfortable" in Belgium as they prepare to play in Friday's Davis Cup final
Walking round Brussels today is a bit like walking round a city on Christmas Day - it's a touch surreal.
Former British number one Tim Henman has cancelled his plans to attend the Davis Cup final with his family amid security fears in Belgium.