Pakistan is vowing to keep up the pressure on Islamist militants, a day after a bomb attack that killed at least 40 people.The attack was on a mosque near the headquarters of the army in the city of Rawalpindi, just north of the capital Islamabad. Two suicide bombers blew themselves up and two other militants opened fire on worshippers. Last night up to 40 militants also attacked an army checkpoint in the Wana region, killing at least one soldier. People across the country are being warned to be vigilant. An explosion that killed two people in the city of Peshawar this morning was originally thought to be a bomb attack, but police later said it appeared to be accidental. The government has denounced the latest violence, saying militants will not defeat what it calls the national resolve to fight terrorism and militancy. Pakistan faces a rising Taliban insurgency and mounting US pressure to take on Islamist fights in areas bordering Afghanistan.