Starting with August 7, 2015, several significant attacks have been launched by insurgents (and at least two of them by Taliban fighters) against “Afghan army and police and U.S. special forces”, in or near Kabul, Reuters reports on August 8. At least 50 people were killed and several hundred have been wounded, and open sources say the attacks almost destroyed “hopes that the Taliban might be weakened by a leadership struggle after their longtime leader's death”.
Three major attacks took place, and “Taliban spokesman Zabihullah Mujahid said the insurgents launched both the police academy and Camp Integrity attacks”. It is not clear who has launched the third attack, on Friday [August 7] morning, in which a large “truck bomb… exploded in a heavily populated district of the capital”. The very large total number of victims made open sources to directly state that Friday, August 7, 2015, is to be regarded as “the deadliest day in Kabul for years”.
A BBC piece of news is reporting that Nicholas Haysom, the head of the United Nations mission in Afghanistan, declared that “we [the UN] suspect the upsurge in violence may be triggered by the succession battle within the Taliban”.
 Mirwais HAROONI, Jessica DONATI, “Attacks on army, police, U.S. special forces kill 50 in Kabul”, Reuters, August 8, 2015, at the Internet address http://www.reuters.com/article/2015/08/08/us-afghanistan-attack-idUSKCN0QC1U920150808