The President, Prime Minister and other Estonian leaders offered condolences following an explosion during a concert at Manchester Arena in which at least 22 people were killed and 59 were injured.
"This is an attack against us all, our way of life and our common values," Ratas wrote, offering condolences to Prime Minister Theresa May and the people of the U.K. "There is no justification to this barbaric deed.
"On behalf of the Estonian government and the people of Estonia, my heartfelt condolences to the people of our good friend and close ally the United Kingdom. Our thoughts are with the loved ones of those who lost their lives in the attack. Wishing a speedy recovery to the injured."
Nestor: Normal people will never be able to understand
"In Europe, today began with sad news," President of the Riigikogu Eiki Nestor said. "Our thoughts go to the families and close ones of the victims, and we wish the injured a speedy recovery."
Nestor emphasized that each terrorist attack, no matter where it took place, shook all of Europe. "Normal people will never be able to understand or accept anything so brutal, but still we must go on with our lives,” he added. "The people of Europe join together and are united in their minds in order stand more strongly than ever against the terrorist groups that try to split Europe."
Kaljulaid: Fight against terrorism Europe's common concern
President Kersti Kaljulaid also sent condolences to Queen Elizabeth II and the loved ones of those killed in the attacks and wished a speedy recovery to the injured. "Estonians' thoughts are with the U.K. during this difficult time," she said.
"The fight against terrorism is Europe's common concern," said Kaljulaid. "I unequivocally condemn any terror acts which are an attack on our people, our values and the stability of our societies."
Mikser: Terrorism has no place in our world
"Today is a sad day for Europe," Minister of Foreign Affairs Sven Mikser said according to a ministry press release. "We strongly condemn this brutal act of terrorism. Terrorism has no place in our world and we must fight back against it together. My sincere condolences to the families and loved ones of the victims and wounded and to the people in the U.K.
"We must make the security of our citizens our priority," he emphasized. "The fight against terrorism must above all be decisive, effective and based on international cooperation."
Tsahkna: U.K. can always count on Estonia's support
"I gave my condolences to the soldiers of the U.K. in Iraq today, with whom we fight against terrorism side by side here," wrote Minister of Defence Margus Tsahkna on social media, who is currently visiting Iraq. "My deepest condolences go out to the victims, their families and everyone affected by the horrendous attack in Manchester.
"In this dark hour, Estonia stands in absolute solidarity with the people of the U.K. As friends and allies, we will continue to work together with the U.K. and other nations in combating terrorism and securing the safety of our people. Together we will be strong and the U.K. can always count on Estonia's support."
No Estonians among victims of the attack
Estonian Ministry of Foreign Affairs press officer Sandra Kamilova confirmed to ERR that according to initial info, no Estonain citizens were among the victims of the explosion.
At 10:35 p.m. on Monday night, immediately following the conclusion of a concert by U.S. singer Ariana Grande, an explosion went off at Manchester Arera, a popular sports and event venue, where many of the concertgoers were young and teenage girls.
At least 22 people were killed and nearly 60 injured in the explosion. Authorities are investigating the incident as a terror attack.
The Islamic State group has taken credit for the attack.
Editor: Aili Vahtla