THE dreaded militant outfit that once held sway over Pakistan`s former Fata may have been driven out from its stronghold and splintered, but its sanctuaries across the border in Afghanistan remain a security threat for the region. A recent spike in the attacks on Pakistani security forces in North Waziristan district and reports of reactivation of terrorist cells must be a cause of concern. A recent UN monitoring team report has revealed that most of the 6,000 to 6,500 Pakistani militants in Afghanistan belong to the various factions of the banned Tehreek-i-Taliban Pakistan. They are now operating from their bases in eastern Afghanistan. While many recent terrorist attacks in Pakistan have been traced to T TP splinter groups, some of the fugitive militants have joined the self-styled Islamic State (IS)group and are not only fighting the Afghan and American forces but are also engaged in a turf war with the Afghan Taliban. The original leadership of the Khorasan chapter of the outfit came from the ranks of TTP fugitives in Afghanistan. There has been a marked escalation in the terrorist attacks claimed by the group, whose origins lie in the Middle East, following the February peace deal between the US and the Afghan Taliban. It has recently carried out some spectacular terrorist attacks in the Afghan capital Kabul, targeting civilians in an effort to disrupt the Afghan peace process. The UN report estimates the membership of the IS in Afghanistan at 2,200. Although its numbers have depleted in the last few years, IS has shown that it has the capacity to penetrate high-security zones via suicide bombings. Despite losing territorial control in parts of the eastern Afghan province of Nangarhar to the Afghan Taliban, IS has proved its effectiveness at carrying out attacks. The rise in activities of the mutated TTP factions on both sides of the Pak-Afghan border raises some serious questions. Such a large number of trained militants dislocated from their home bases and with no resources could easily be turned into mercenaries and would be willing to work for vested interest groups and foreign intelligence agencies. The ongoing war in Afghanistan and regional conflicts make it easier for these mercenaries to be used as proxies.The recent militant attacks in North Waziristan district and other parts of the county seemed well-planned. Surely the splinter groups do not have the capacity and support base to re-establish their control in their former strongholds. But they can create problems for the security agencies. The danger is more serious with the situation in the former tribal areas, particularly Waziristan, not yet fully settled. It could get worse with the conflict in Afghanistan. Across-the-border militant sanctuaries are often used for proxy wars. The UN report, which states that thousands of anti-Pakistan militants are operating in Afghanistan, only reinforces earlier reports of the TTP`s cross-border operations. It`s not only the TTP but also groups like the Balochistan Liberation Army that have allegedly found safe haven in Afghanistan. And it`s not just about Afghanistan but also militant sanctuaries inside Pakistan allegedly engaging in cross-border terrorist activities. By not taking action against militant safe havens, countries lose their sovereignty. Pakistan has paid hugely for its wrong policies of allowing militant sanctuaries on its soil in the past. But we can`t afford more such adventures at the risk of our own sovereignty and national security. With the ongoing war in the country, the Afghan government may not have the kind of control needed to take action against militant sanctuaries, but the danger is that outside interests could exploit this situation. One of the most significant points of the US-Taliban peace deal is not to allow Afghan soil to be used for action against other countries. It will also be a part of the political settlement in the wartorn country. More importantly, there is a need for an agreement on the issue of regional security. • The writer is an author and journalist.