With police and other security agencies on high alert following the twin blasts in Mumbai, a sensation was created in Delhi on Wednesday when a man opened fire in an office in the World Trade Centre tower.

The man, who was wearing a mask, fired two rounds in the office of Swiss International Airlines in the building at Connaught Place before fleeing with Rs 10,000 and a mobile phone.

Fearing a terrorist attack, policemen rushed to the multi-storeyed building after the Police Control Room flashed a message about the shooting at around 1655 IST.

The assailant apparently used a .765 MM Chinese pistol, Joint Commissioner of Police (New Delhi Range) Maxwell Pereira said.