"As a precaution we have closed factories temporarily," a spokesperson for the
group told the AFP news agency.
ABB employs about 1,600 people in the country, where it has an annual turnover of about $300 million dollars, and builds power generation equipment and industrial robots.
"Our main focus is the safety of our employees and to be able to support our clients. We follow the situation hourly and see to it that our employees are kept updated," said Ericsson's Fredrik Hallstan.
"Our employees can work from home if they so wish. And if they stay at home they are kept regularly informed over the precautions and recommendations that they should follow," he added.
Hundreds of thousands of Egyptians rallied on Tuesday for the biggest day of protests yet in their campaign to oust President Hosni Mubarak.