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(CNN) -- He's one of the world's most famous boxers but this could be Amir Khan's toughest fight yet.

Khan landed in Pakistan on Wednesday and promised to help rebuild the school in Peshawar where 132 children were killed by the Taliban in the country's deadliest-ever terror attack.

The British boxer, who has Pakistani roots, announced his intention set up boxing academies for youngsters in the country, while the sale of his $45,000 shorts will help to rebuild the school.

"What has taken place in Peshawar is absolutely horrific and sickening," the WBC welterweight world champion told a news conference in Islamabad.

"After recently becoming a father myself, I can't imagine how the families of these innocent children are feeling."

"The main reason I came to Pakistan was to show the world that Pakistan is a safe place, and it's a place I love coming to and you know, we want to all fight against terrorism."

Gunmen stormed the army-run school in the city of Peshawar, which is in the north west of the country, earlier this month.

Khan, 28, announced his intention to help rebuild the school following his successful title defense against Devon Alexander in Las Vegas earlier this month.

He became a father last May when his daughter Lamysa was born and wants to help the survivors following the tragic event.

Speaking to British media ahead of the trip to Pakistan, Khan revealed the timing of his trip was vitally important.

"Talking about this stuff could be threatening for me, but I just want to speak the truth and tell people what is happening is wrong," he said.

"I think it's more important now than ever to go over there. I think it will send a statement to a lot of people that Amir Khan is going there to make a difference.

"I want it to be a better country. It's just a shame -- I cannot believe how sick some people are."

Pakistan has seen plenty of violence, much of it involving militants based in provinces such as South Waziristan, North Waziristan and the Khyber Agency -- all restive regions in northwest Pakistan near Peshawar along its border with Afghanistan.

It is the home base of the TTP, an organization that has sought to force its conservative version of Islam in Pakistan. The group has battled Pakistani troops and, on a number of occasions, attacked civilians as well.

Peshawar, an ancient city of more than three million people tucked right up against the Khyber Pass, has often found itself in the center of it all. Militants repeatedly targeted the city in response to Pakistani military offensives, like a 2009 truck bombing of a popular marketplace frequented by women and children that killed more than 100 people.

And the Taliban hasn't hesitated to go after schoolchildren. Their most notable target is Malala Yousafzai, who was singled out and shot on October 9, 2012 as she rode to school in a van with other girls. The teenage girl survived and, this year, became the youngest recipient of the Nobel Peace Prize for her efforts to promote education and girls' rights in Pakistan and beyond.

Yousafzai was "heartbroken by this (latest) senseless and cold blooded act of terror in Peshawar," saying that "innocent children in their school have no place in horror such as this."

"I call upon the international community, leaders in Pakistan, all political parties -- everyone -- (to) stand up together and fight against terrorism," the 16-year-old added in another statement. "And we should make sure that every child gets a safe and quality education."

Read: Taliban terrorists kill 145

Read: Students and teachers recount the horror