SAN FRANCISCO (CBS SF) — Recording artist Mariah Carey cancelled her upcoming March 27 performance in Brussels over security concerns in the wake of the terrorist bomb attacks earlier this week.

The R & B performer made the announcement on Twitter saying,”I love my fans in Brussels and at this time I am being advised to cancel my show for the safety of my fans, my band, crew and everyone.”

READ MORE: Firefighters Extinguish 2 RVs on Fire in West Oakland

Carey joins a legion of Americans who have changed or cancelled travel plans to Brussels since the bombing attacks on the city’s airport and subway system. At least 31 people were killed and 270 wounded. So far, six people have been detained in raids conducted around the city.

The State Department has issued warnings for U.S. citizens traveling to Belgium. The threat level was FOUR, the highest on the Belgium scale on Tuesday and was lowered to THREE on Thursday. According to the U.S. Embassy website, the “threat of more attacks is serious, possible, and probable.”

READ MORE: Fauci Warns of 'Potential' for Fifth COVID-19 Wave, Stresses Vaccines and Boosters

Flights in and out of Brussels International Airport has been cancelled and is scheduled to resume on Sunday. The metro in the capital city is running on a limited basis.

A day after the attacks, an online survey by the travel website Skift of 1000 travelers with plans to go to Europe found that a fifth of them had already canceled their trips and 28% were “rethinking” their plans.

MORE NEWS: Trust Fund Set Up For Slain Security Guard Kevin Nishita

Carey is currently touring Europe and South Africa as part of her Sweet Sweet Fantasy 2016 tour. After the attacks she tweeted “my thoughts and prayers are with the people of Belgium.”