Updated from 10:45 a.m. EST

Several companies that sell equipment for airline security were rising after Saturday's terrorism scare.

InVision Technologies

(INVN)

,

Visage Technology

(VISG)

and

Visionics

>

(VSNX)

were all higher in early trading. InVision is a maker of explosive-detection technology, while Visage and Visionics make face-recognition systems. The companies were being bid up in the wake of Saturday night's incident on American Airlines Flight 63, in which a man was subdued as he tried to ignite smuggled explosives.

CSG Systems International

(CSGS) - Get Report

agreed to acquire the billing and customer care assets of

Lucent Technologies

(LU)

for about $300 million in cash. The business consists primarily of software products and related consulting services acquired by Lucent when it purchased Kenan Systems in February 1999. It has about 1,300 employees and serves more than 200 service provider customers in 40 countries.

Schering-Plough

(SGP)

was rising after the FDA cleared it to sell a new allergy medication. The company received approval for Clarinex, the successor to its blockbuster Claritin, which loses patent protection in 2002. The gain comes despite Schering's warning that fourth-quarter earnings would fall below expectations and that it might have to pay $500 million to resolve manufacturing issues with regulators.

Sepracor

(SEPR)

, which will collect a royalty on Clarinex, was also gaining on the clearance.

Edison Schools

(EDSN)

was gaining after Philadelphia put its school system under the control of a committee that comprises appointees of the city and the state of Pennsylvania. Edison, a private company that manages public schools, is negotiating to be a lead provider in cooperation with local community groups to manage 45 of the 60 schools placed under the committee's oversight.

Hotjobs.com

(HOTJ)

said it determined that an unsolicited takeover offer from

Yahoo!

(YHOO)

is superior to a previous bid from

TMP Worldwide

(TMPW)

. Hotjobs.com gave TMP 72 hours to improve its bid before it accepted the $436 million cash and stock offer from Yahoo! TMP's offer has dropped to about $341 million from its original $498 million because of a decline in the company's share price.

Shares of

WatchGuard Technologies

(WGRD)

tumbled after the company warned of a wider-than-expected loss in its fourth quarter due to weak sales for its high-end products. The Internet security firm now expects to post a loss of 23 cents to 29 cents a share for the quarter, compared with a profit of 3 cents a share in the year-ago period. Analysts had expected WatchGuard to post a loss of 4 cents a share, according to earnings tracker Thomson Financial/First Call. Revenue for the quarter should total $11 million to $13 million.

Adolph Coors

(RKY)

, the No. 3 U.S. brewing company, said Monday it would buy

Interbrew's

(INTB)

Carling Brewers UK division for $1.7 billion. The Golden, Colo.-based firm Coors said it plans to finance the purchase with about $200 million in cash on hand and a combination of bank and public debt. The company did not disclose further terms, but the acquisition is subject to U.K. regulatory approval. The companies anticipate completion of the transaction by early February 2002.