A wave of deadly attacks on government offices in the Afghan capital are "troubling" and the latest sign of a Taliban bid to undermine the Kabul government, a Pentagon spokesman said on Wednesday.

"These attacks were somewhat bold and brazen and troubling," Bryan Whitman told reporters.

He said the US military would be "taking a look at these type of activities for any patterns."

The coordinated suicide bomb and gun attacks on three Afghan government buildings on Wednesday killed at least 26 people and wounded 55 others in violence that spread panic across the city.

"I'm sure the Afghan government will be taking a look at all aspects of this attack to find out why it was as successful as it was," he said.

"It was clearly a tragic series of attacks that took place."

He said that "terrorists have the advantage when you have people willing to kill themselves."

Whitman said he could not discuss possible security steps taken by NATO forces in Afghanistan in response to the assault by Taliban militants.

He added that the Taliban was seeking to sabotage the Afghan government.

"I think we've seen activity in the last several weeks that demonstrates the Taliban is still making attempts to go after the successes of the (Afghan) government."

The assault came after a report issued earlier this month by the Defense Department that warned US-led forces lacked the troops and resources to control the south of the country, and that a rejuvenated insurgency was gaining momentum.

The report to Congress predicted the insurgents would most likely try to stage a high-profile attack, similar to the failed assassination attempt on Afghan President Hamid Karzai in April 2008.

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