As it happened: 16 arrests made in night of anti-terror raids across Belgium, but Salah Abdeslam still missing

Belgian PM Charles Michel warns threat of 'serious and imminent' attack in Brussels remains

A Belgian soldier stands guard in Rue Neuve, the busiest shopping street in Brussels, now empty due to the terror alert level being elevated to 4/4, in Brussels, Belgium, 21 November 2015 (EPA)

Here are the latest updates:

• Belgian PM announces highest terror threat level will remain into Monday
• Brussels remains on high level of alert during large police operations in the streets
• Identity of third attacker involved in Stade de France suicide bombing identified
• Charles Michel orders all schools and universities to close
• Brother of on-the-run suspect Salah Abdeslam appeals for him to 'surrender'
• Police say Abdeslam could be in Brussels 'ready to blow himself up'
• Amid heightened threat level, pigeon sparks evacuation of Gare du Nord
• Pictures provide first look inside Paris flat site of Saint-Denis raid
• Handler reveals Diesel the police dog was due to retire
• 'Armed police' arrest three men and evacuate central London street
• David Cameron to unveil plan for air strikes on Isis in Syria
• Osborne tells Andrew Marr a lost Syrian vote would be 'publicity coup for Isis'
• Labour's John McDonnell hints at possible rethink on support for air strikes
• Paris declares itself 'battered but still afloat'
• And a couple in Brussels refuse to let terror threat spoil their wedding

Armed police and soldiers are patrolling the streets, subways are closed and many shops have shut their doors in the Belgian capital Brussels as the government issued a warning over possible Paris-style terror attacks.

At least one suspect from the deadly Paris attacks just over a week ago is at large and was last seen crossing into Belgium.

Belgian prime minister Charles Michel said the decision to raise the threat alert to its highest setting was taken "based on quite precise information about the risk of an attack like the one that happened in Paris ... where several individuals with arms and explosives launch actions, perhaps even in several places at the same time".

At least one Paris attacker, Salah Abdeslam, crossed into Belgium the morning after the attacks. Paris officials say they have no firm information on Abdeslam's whereabouts, including whether he was in the Brussels area.

Brussels, a city of more than one million, is home to the headquarters of the European Union, the Nato alliance and the offices of several multinational corporations.