The U.S. government is considering issuing a travel warning for Americans going to Europe, amid indications that al-Qaida may be planning new attacks there. U.S. and European officials say the State Department could issue the alert as soon as Sunday. The Associated Press reports that the alert will not specify any particular countries. The news comes days after Western intelligence officials said they had uncovered a terror plot to strike several European cities. The officials said they had information the attacks had been planned by terrorist groups operating in Pakistan's lawless tribal regions. Also Saturday, the second audio tape in as many days believed to be from al-Qaida leader Osama bin Laden was posted on the Internet. On it, bin Laden urges Muslims to do more to help the victims of the recent floods in Pakistan. U.S. and British news reports quoting unnamed security officials say the suspected terror plot calls for attacks similar to those launched in Mumbai (India) in 2008. Heavily armed Islamic militants stormed multiple sites in the Indian metropolis, killing 166 people. Some of the details of the alleged plot are said to have come from a German national (Ahmed Siddiqui) who was captured in Afghanistan in July.