Peshawar attack: Pakistan police warn terrorists could plant magnetic bombs on school buses

Letter urges schools to increase security

A journalist reacts as he visits the Army Public School that was attacked by the Taliban militants in Peshawar

Pakistan police are warning schools to check underneath buses and vehicles carrying students amid fears terrorists are planning to plant magnetic bombs on school buses.

Islamabad authorities issued a letter urging schools to up security after the Taliban attack on a Peshawar school, where more than 130 children were killed by seven militants.

The letter, a copy of which has been obtained by Sky News, asked schools to check under vehicles transporting students for explosive devices.

In the wake of Tuesday's bloodshed, Prime Minister Nawaz Sharif lifted a ban on the death penalty for terrorist crimes, which has been in place since 2008.

In Kabul, Pakistani army chief Raheel Sharif met in Kabul with Afghan President Ashraf Ghani and with Afghan and US military officials and shared intelligence about the attack, the military said.

The Pakistani Taliban, which has waged an insurrection against the government for a decade, claimed responsibility. The group says it was seeking revenge for a military assault launched in June in North Waziristan.