THE tragic slaughter of eight innocent children has left the nation’s leaders shocked, saddened and horrified.

Prime Minister Tony Abbott said the “unspeakable crime”, in the same week as the Sydney siege that claimed two innocent hostages’ lives, made for trying times.

“The news out of Cairns is heartbreaking,’’ he said.

“All parents would feel a gut-wrenching sadness at what has happened. These are trying days for our country.

“Tonight, there will be tears and prayers across our country for these children.

“My thoughts are with the Queensland Police, and all who have to respond to this terrible situation.’’

And Queensland Premier Campbell Newman said on Twitter: “I am deeply saddened and shocked by the tragic events in Cairns. My thoughts and prayers are with the family and friends of those concerned.

“I ask that all Queenslanders reach out to those who may need support in coming days and do not hesitate to seek professional assistance if needed.”

Federal Opposition Leader Bill Shorten said: “Today’s tragedy in Cairns comes at the end of one of the toughest weeks for our nation.”

The Labor leader added: “There’s no greater evil than the killing of children.”

Mr Shorten and Senator Jan McLucas, shadow minister for mental health, said: “To the people who knew, loved and lost these beautiful children, none of us can imagine your pain, but all of us are with you in your grief.

“How something like this could occur is beyond anyone’s comprehension. Go home, hug your children, call your parents — because life is too short and too fragile.’’

Federal MP Warren Entsch, whose seat takes in Cairns, said he struggled to comprehend the gravity of the situation.

“People are shaking their heads and saying, ‘How could you believe something like this could happen in Cairns?’.

“The Torres Strait Islander community is going to be absolutely devastated by the loss of so many beautiful young lives,” Mr Entsch said.

Local pastor Nicole Dalla Vecchia, 30, joined those at the scene to offer support.

“I felt sick when I saw the picture,” she said.

“It doesn’t matter if you know them or not, it breaks your heart.”

The local community was like one big family, Ms Dalla Vecchia said.

Global media were reporting on the horrifying killings.

kathryn.powley@news.com.au