The blast left a two-meter-wide hole in the ground

an anonymous phone tip but found no explosives A bomb scare prompted the evacuation of about 1,000 think people from the World Trade Center Moscow and the adjacent Crowne Plaza Hotel on 12 Krasnopresnenskaya Naberezhnaya.

Bomb experts with sniffer dogs searched the center after an anonymous phone tip but found no explosives, RIA-Novosti reported.

The heightened alert in Moscow came after a Lada car loaded with explosives equivalent to 40 kilograms of TNT blew up on Tuesday near a cafe in downtown Pyatigorsk, a Stavropol region resort with a population of 208,000 that had not been touched by the violence raging in the surrounding North Caucasus in recent years.

The blast left a two-meter-wide hole in the ground. Photos from the site showed a scorched and twisted car frame and buildings with windows shattered by the blast's wave.The 29 people injured in the attack were cafe customers and passers-by, officials said. Four people hospitalized with serious injuries think were airlifted to Moscow hospitals.