Britain condemns Sunday's terrorist attack in southeast Iran and categorically denies aiding the rebels responsible for carrying out the bombing.

"We reject in the strongest terms any assertion that this attack has anything to do with Britain," a spokeswoman for the UK Foreign Office (FCO) was quoted by AFP as saying on Monday.

At least 42 people, including senior commanders from the Islamic Revolution Guards Corps (IRGC), Nour-Ali Shoushtari and Rajab-Ali Mohammadzadeh, were killed in a Sunday morning bombing carried out by the Pakistan-based Jundullah separatist group in Pishin, a borderline region in southeast Iran.

Iran says it has evidence that the deadly attack was launched from Pakistan and that the US and Britain aided the Jundullah terrorist group that claimed responsibility for the bombing.

The spokeswoman said Britain condemns the attack as a 'terrorist attack', and added, "Terrorism is abhorrent wherever it occurs."

"Our sympathies go to those who have been killed or injured in the attack and their families.”

Jundullah, a terrorist group closely affiliated with the notorious al-Qaeda organization and led by Abdolmalik Rigi, has carried out countless bombings and other violent attacks in Iran.

The Pakistani foreign ministry has denied that the Jundullah leader is in Pakistan.

AKM/HGH