In early 1999, al-Qaeda operative Khallad bin Attash is sent to Yemen to help al-Qaeda leader Abd al-Rahim al-Nashiri obtain explosives to bomb a ship, and also to get a US visa so he can travel to the US to take part in an operation there. Three 9/11 hijackers get a US visa around this time (see April 3-7, 1999), but bin Attash has more trouble, apparently because he is Yemeni and the others are Saudi. While there, bin Attash is arrested by Yemeni authorities. Bin Laden finds out about the arrest and is concerned that bin Attash might reveal the ship bombing and US operations while under interrogation. Bin Laden contacts a Yemeni official and makes a deal, offering not to attack Yemen if the Yemeni government does not confront him and releases bin Attash in the summer of 1999. Both sides agree to the deal and bin Attash returns to Afghanistan without revealing either plot. [9/11 Commission, 7/24/2004, pp. 155-156] There is other evidence Yemeni officials will help al-Nashiri, as his ship attack plot eventually targets the USS Cole while stationed in Yemen (see April 2000 and After October 12, 2000).