Two suspected militants wanted in connection with the Paris attacks are said to be in the Belgian capital, the mayor of a Brussels district told broadcaster RTBF on Sunday, as the city remained on high alert.
"This danger is real. We have learnt that two terrorists are on Brussels territory and could commit dangerous acts," said Bernard Clerfayt, the mayor of the district of Schaerbeek.
Belgian Interior Minister Jan Jambon also referred to "several suspects."
Many of the Paris attackers had ties to the Belgian capital. For more than a week, police in Brussels have been searching for Salah Abdeslam, the brother of one of the Paris suicide bombers.
Abdeslam, who lives in the Brussels district of Molenbeek, is suspected of being involved in the Paris attacks before returning to the Belgian capital.
The death toll from the November 13 attacks on the French capital has risen to 130, with more than 350 injured.
The alert threat in Brussels remained on the maximum level of 4 for the second day in a row. Public life had virtually ground to a halt.
Service was suspended on Brussels' underground rail network Saturday and is due to be out of service until 3 pm (1400 GMT) Sunday as a precautionary measure, according to the website of transport operator Stib.
Buses, trams and trains continued to provide service in Brussels, with authorities intensifying their checks on passengers.
Extra security was also reported at the nation's airports and train stations.
Outside of Brussels, the rest of the country was put on national security threat level 3, which means "a possible and likely" threat.
By Marion Trimborn
