ROYAL CONDOLENCES: Queen Elizabeth took to Twitter on Wednesday to express her condolences to the families of victims of the terrorist attacks in Brussels.

“Prince Philip and I have been deeply shocked and saddened by the loss of life and injuries after the terrorist attack in Brussels,” she said in a message on her Twitter account. “On behalf of the people of the United Kingdom, we send our most sincere condolences to you, the families of those who have died and all those in Belgium affected by this terrible series of events.”

Brussels went into lockdown following the blasts at Belgium’s main airport and at a metro station in the city center on Wednesday. The country is observing three days of mourning, while a minute’s silence was held at 12:00 noon CET on Thursday to remember the victims.

The monarch will be the subject for ITV’s documentary “Our Queen at 90,” which is slated to air on March 27. The two-hour special comes a few weeks before the monarch’s birthday. The Queen celebrates two birthdays every year: Her actual birthday on April 21 — which is always a private event — and the British monarch’s official birthday, which will be marked this year on June 11, when the Trooping the Colour parade takes place in London. This year, because of her 90th, there will also be a ticketed picnic for the public on June 12.

RELATED STORY: Duchess of Cambridge Takes Part in TV Special for Queen’s 90th >>