Safer America's top-selling products are the gas masks ($100-$250), parachutes ($850-$1,500) and iodide tablets ($10-$12).

NEW YORK (CNN/Money) - Plenty of calls poured into Safer America over the weekend -- a New York City retail store that sells gas masks, parachutes and a myriad of other personal protection products -- including a few from concerned Citigroup employees.

Lionel Uzzan, CEO of the Manhattan-based retailer, told CNN/Money Monday that he had already anticipated a busier than usual start to the work week after Homeland Security Secretary Tom Ridge on Sunday identified Citigroup's New York headquarters as one of the possible targets of a terrorist attack.

"Our Internet orders multiplied nearly five-fold over the weekend," said Uzzan, explaining that the unusual volume was partly due to the fact that the store is open only on weekdays.

"But my staff tells me that we've had a lot of phone messages as well and we're trying to catch up to all of them as soon as we can," he added.

Although he declined to name specific companies, Uzzan said that several Wall Street firms, including major financial services providers, could be counted among Safer America's biggest clients and make up about 70 percent of its customer base.

The company, which was founded in June 2002, sells a variety of safety kits designed for individuals, families and for people who work in high-rise buildings, priced between $350 to $1,400.

"We've been in contact with some Citigroup workers who've called asking for our products but we haven't officially heard from Citigroup's security office," Uzzan said.

Gas masks, parachutes designed especially for high-rise buildings, mini-safety kits and iodide pills, consumed for protection against exposure to radioactive substances, are the retailer's top-selling products.

"Our new millennium gas masks have a new feature that can protect against a dirty bomb. People have been buying those," said Uzzan.

Last year, the retailer took in about $2 million in sales but has already passed that mark in the first half of this year.

Prior to the terror alerts, Uzzan said the company was working with security agencies to provide equipment such as the "Peace of mind" escape hoods for attendees of the upcoming Republican National Convention, which begins August 30 in Madison Square Garden.

The hoods are able to filter out smoke and particles such as bacteriological contaminants.

Citigroup could not immediately be reached for comment.