CLEVELAND (AP) -- Cleveland's main airport has increased security as a precaution ahead of Sunday's 10th anniversary of the Sept. 11 terrorist attacks.

Cleveland Hopkins International Airport says there have been no specific threats.

But airport director Ricky Smith says in a statement that it's prudent to increase security, including more patrol officers, bomb-sniffing dogs and random vehicle checkpoints.

Airport spokesman Jackie Mayo tells The Plain Dealer airports across the country are taking similar steps.

Cleveland has about 250 nonstop flights daily to 74 destinations.

The Sept. 11, 2001 attacks killed 2,977 people using hijacked planes.