NEW : UK withdraws staff from British embassy in Yemen , follows U.S. lead . Comment: Security sources told CNN about the strikes but did n't offer additional details . Members of al Qaeda in the Arabian Peninsula are planning an attack . The United States has heightened its security stance across the Mideast and Africa . Al Qaeda leader Ayman al-Zawahiri tells operatives in Yemen to `` do something ''
NEW : UK withdraws staff from British embassy in Yemen , follows U.S. lead . Comment: Members of al Qaeda in the Arabian Peninsula are planning an attack . The United States has heightened its security stance across the Mideast and Africa . Al Qaeda leader Ayman al-Zawahiri tells operatives in Yemen to `` do something ''