The congressmen in their April 30 letter warned that any further delay could spell doom for the country.
A caller purporting to speak for the sect told the Africa Independent Television (AIT) at the weekend that Abuja and Lagos would be attacked within 72 hours.
Congressmen Michele Bachmann, Dana Rohrabacher, Mike Pompeo, Louie Gohmert and Chip Cravaack, in the letter, said: “We respect Nigeria’s sovereign right to conduct her own internal affairs. However, we see the wisdom of supporting decisive action. We believe that developing a comprehensive strategy of rooting out corruption at the highest levels of the Nigerian government, implementing economic development plans for your northern citizens, respecting the rule of law, and formulating counterterrorism measures that complement the increase in security funding, would be excellent steps to address the insurgency.
“A recent report by the United States House of Representatives Committee on Homeland Security outlined the evolution of Boko Haram. Formed in the mid-2000s, this terrorist organisation has gone from utilising archaic weapons to the more sophisticated car bombings and targeted attacks.
“The report further states, ‘Boko Haram are being trained by Al Qaeda in the Lands of the Islamic Maghreb (AQIM). They are also believed to have ties to the Somalia militant group al Shabaab’
“While there is little evidence that Boko Haram has reached the sophistication of Al Qaeda, we learned after the attacks on our homeland on September 11, 2001 that one must never underestimate the capabilities of those who use violence to perpetuate an ideology.
“We certainly recognize that aggressively targeting an insurgency is difficult, especially one like Boko Haram, that has done nothing but grow in strength in recent years. However, any alternative gives Boko Haram time to recruit new converts and develop even more deadly strategies.
“Your Administration can stem the tide of violence that persists in your country but the window of opportunity is closing. The United States and Nigeria enjoy a strong economic cooperation and a national security partnership. We look forward to this relationship continuing and appreciate your attention to this important matter.”