Taliban attack Afghan army bases days after peace deal
The intra-Afghan negotiations are due to begin 10 March according to a US-Taliban deal signed in Doha on Saturday, but a dispute over a prisoner swap has raised questions about whether they will go ahead.
The agreement includes a commitment for the Taliban to release up to 1,000 prisoners and for the Afghan government to free around 5,000 insurgent captives - something the militants have cited as a prerequisite for talks but which President Ashraf Ghani has refused to do before negotiations start.
The row has highlighted the tough road ahead, with the Taliban's decision to end a partial truce on Monday complicating matters further.
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A defence ministry official, speaking on condition of anonymity, told AFP of overnight attacks on government forces in 13 of the country's 34 provinces.
Two soldiers were killed in one of the attacks that happened in southern Kandahar province, a government statement said.
An attack in Logar province near Kabul - which was not included in the defence ministry official's tally - killed five security forces, the provincial governor's spokesman Didar Lawang told AFP.
The halt to the limited truce, which began on 22 February, ends what was a welcome reprieve for ordinary Afghans who have born the brunt of the deadly violence.
But experts said the move was unsurprising as both sides seek to exploit whatever leverage they hold to force the other's hand.
"Of course violence will go up, was bound to happen. no surprise Ghani balking on prisoner release: 1 of his few levers," Vanda Felbab-Brown, a senior fellow at the Brookings Institution, tweeted.
Kabul-based analyst Ahmad Saeedi told AFP the uptick in attacks reflected the insurgents' belief that "they have to keep the battlefield hot to be able to win on the negotiating table, as they did with the Americans".
'So far, so good'
Ghani's government last week sent a delegation to Qatar to open "initial contacts" with the insurgents but Taliban spokesman Suhail Shaheen on Tuesday said the militants would not meet Kabul's representatives except to discuss the release of their captives.
Apparent differences between the Doha agreement and a joint US-Afghan declaration released in Afghanistan underline the obstacles facing negotiators.
The US-Taliban deal committed to the release of prisoners while the Kabul document only required both sides to determine "the feasibility of releasing" captives.
Read also: Taliban to resume attacks on Afghan forces despite US peace deal agreement
In a statement, the UN's Afghanistan mission called for "continued reduced violence to maintain & enhance an environment conducive to the start of intra-Afghan negotiations".
Since the deal signing, the Taliban have been publicly claiming "victory" over the US.
Speaking to Fox News, US Secretary of State Mike Pompeo played down the militants' comments.
"So I've seen lots of remarks. Just watch what really happens. Pay less attention to statements, pay less attention to things people say," Pompeo said.
"Watch what happens on the ground. There's been a lot of work done at detailed levels about how this will proceed. So far, so good."
Under the terms of the deal, foreign forces will quit Afghanistan within 14 months, subject to Taliban security guarantees and a pledge by the insurgents to hold talks with Kabul.
Agencies contributed to this report.