CNN's Sheila MacVicar said the latest blasts displayed a change in tactics by Palestinian militants.
Caldwell says the forces retrieved a treasure trove of documents that will help find other militants.
Mr Ban also called for the creation of a second force to fight militants.
Ennahda is often accused of tolerating these more radicalized militants or not taking them seriously enough.
Mr. Sharif has avoided explicit criticism of the Taliban, calling instead for negotiations with the militants.
And a senior Indian army official suggested the militants may have come from Pakistan.
France intervened militarily in January amid fears that the militants were preparing to advance on Bamako.
France's Defence Minister, Jean-Yves Le Drian, said he appeared to have fought alongside Islamist militants.
Israel insists that about 30 of the Palestinian fighters are on its list of wanted militants.
By the end, six suspected militants were detained and Bancroft took the bomb for analysis.
Afghan officials said that 34 civilians, 10 members of the security forces and nine militants died.
And meanwhile, the threat of weak governments and strong militants hangs over a troubled Middle East.
France intervened after saying the al-Qaeda-linked militants threatened to march on the capital, Bamako.
Of the 375 Palestinians killed, most were Hamas militants, Palestinian medical sources said Tuesday.
Earlier in the day, Israeli forces took "tens of Hamas militants" into custody, the military said.
It is thought the mountainous areas around Kidal provide perfect hiding places for the militants.
Peshawar borders Pakistan's volatile tribal areas, where many of the country's militants are based.
India's army and paramilitary forces insist that a few hundred armed militants are still active.
For its part, Pakistan's military defends its efforts to take on the Islamist militants.
When that failed, Mr. Sellal said, the militants turned their efforts to blowing up the plant.
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The militants' attacks caught Khartoum by surprise, and it had very few troops in the region.
Two suspected militants were also killed in a shoot-out with police following the discovery.
French-led forces are continuing their offensive against Islamist militants who seized northern Mali last year.
BBC: Mali crisis: 330 UK military personnel sent to West Africa
Despite this, Yemen remains plagued by political unrest, including clashes between security forces and Islamist militants.
Yemeni security forces, meanwhile, shot dead two militants north of the capital, Sanaa, said officials.
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India also accuses Pakistan of supporting the militants in Kashmir, an allegation Pakistan denies.
Nevertheless, its new government has stepped up the pursuit of militants in its tribal regions.
Algeria and Egypt have eased tensions with their Islamist militants by granting amnesties to prisoners.
There have been several US drone strikes against militants in Yemen in recent days.
The Pakistani government is under intense pressure to act decisively against militants operating on its soil.
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