Explosions were heard in the Afghan capital Kabul Sunday, Agence France-Presse journalists said, with the Taliban government saying they were responding to aerial Pakistan attacks. A spokesman for Afghanistan’s defence ministry said “air defence strikes were carried out against Pakistani aircraft in Kabul”. Months of cross-border clashes have flared since Thursday when Afghanistan launched an offensive along the frontier, with Pakistani forces hitting back on the border and from the skies. The...