NEW : Officials at the Chinese Embassy in Washington did not immediately respond to a request for comment . Pakistani officials : The attack is part of a ` ` malicious plot '' Pakistani officials : ` ` We have strong suspicions '' Relations between the U.S. and Pakistan were heightened by the secret U.S. involvement .
NEW : Pakistani officials : The attack is part of a ` ` malicious plot '' Pakistani officials : ` ` We have strong suspicions '' Relations between the U.S. and Pakistan were heightened by the secret U.S. involvement .