President Mahinda Rajapaksa has expressed his concerns over increasing terrorist activities in several countries, including Canada.

The President, in a twitter post a short while ago, expressed his concerns and disappointment over this matter, stating every party should work together to being this to a halt.

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“Very disturbing to see increasing terrorist acts in many countries, now in Canada.Must unite as equal partners to fight menace,” President Rajapaksa’s Twitter post said.

Meanwhile, Canadian media reported that a number of world leaders had reacted to the news of the attack which saw gunfire sprayed through the hall of honour in Canada’s Parliament.

U.S. President Barack Obama said he was rattled by it.

There are images of him on his first foreign trip as president, laughing with Prime Minister Stephen Harper as they walked down that Gothic-style ceremonial hallway in February 2009.

“I had a chance to travel to the Parliament in Ottawa. I’m very familiar with that area,” Obama recalled Wednesday.

“I am reminded of how warmly I was received and how wonderful the people there were. And so, obviously, we’re all shaken by it. But we’re going to do everything we can to make sure that we’re standing side by side with Canada during this difficult time.”

Meanwhile, British Prime Minister David Cameron too expressed his condolences on Twitter this morning.

“I’m appalled by today’s attack in Ottawa. I offer my full support to @pmharper and the Canadian people as they deal with this incident,” Cameron said.