The United States closed its consulate Tuesday in this southern Pakistani city because of a security threat. The consulate warned American citizens not to visit the building or the nearby Marriott Hotel until further notice.
"We received information that increased our security concerns," Greg Crouch, U.S. Embassy spokesman said in Islamabad, the capital.
He declined to discuss the nature of the threat but said the consulate would reopen today.
Militants have launched a string of attacks, including two against the U.S. Consulate, in Karachi in recent years.