US President Barack Obama will convene a meeting of his Afghan war cabinet today to assess the first major offensive of his troop surge strategy against the Taliban. The meeting in the secure White House Situation Room also comes after the reported capture by US and Pakistan spies of the Taliban's top military commander, in what was apparently a huge blow to the Afghan insurgency. Obama will meet top officials including Vice President Joe Biden, Defense Secretary Robert Gates, Secretary of State Hillary Clinton, and General David Petraeus, head of US Central Command. War commander General Stanley McChrystal and US ambassador to Kabul Karl Eikenberry were due to take part in the meeting by video conference, the White House said. US and other media reported on Tuesday that Taliban military commander Mullah Abdul Ghani Baradar was arrested in Pakistan's port city of Karachi several days ago. The White House refused to confirm the arrest, which would mark a watershed in the US campaign against the Taliban. US, NATO and Afghan troops meanwhile pressed on with a major assault against the Taliban bastion of Marjah in southern Afghanistan, key to Washington's new strategy for turning around the troubled war.