* Suicide bomber set off second, larger explosion
* Second blast targeted those rushing to help after first
* Deadliest attack in Kabul in weeks

A Taliban suicide attack in a busy area near the defence ministry in Kabul on Monday killed at least 24 people and wounded 91, the deadliest toll in the Afghan capital in weeks.
There were two blasts in quick succession in a crowded area of the city near government buildings as well as a market and a main intersection, defence ministry spokesman Mohammad Radmanesh said.
Troops, police and civilians rushing to help victims of the first explosion were caught in the second, triggered when a suicide bomber blew himself up, officials said.
The casualty may increase as more information becomes available, Mohammad Ismail Kawousi, a spokesman for the public health ministry, said.
The Taliban, who have stepped up their campaign against the Western-backed government in recent weeks following a brief lull after the death of their former leader, Mullah Akhtar Mansour, claimed responsibility for the attack, which it said killed 58 officers and commanders.
The double bombing came less than two weeks after gunmen attacked the American University in Kabul, killing 13 people.
It was the deadliest attack in Kabul since at least 80 people were killed by a suicide bomber who targeted a demonstration on July 23. That assault was claimed by Islamic State.
Government officials have been preparing for a conference in Brussels next month at which foreign donors, concerned about the ability of the Afghan security forces to withstand Taliban violence, are expected to pledge continuing support over coming years.