SAN JOSE, California — Demand for the new iPad tablet is exceeding supply, causing Apple to stall its international rollout by a month, the company announced Wednesday morning.

In a statement, Apple said it has so far delivered more than 500,000 iPads that run on Wi-Fi networks and sales “will likely continue to exceed our supply over the next several weeks.” It called the new tablet “a runaway success in the U.S. so far.”

Apple also said it has taken “a large number” of pre-orders for iPads that run on 3G networks, which will be delivered the end of April.

“Faced with this surprisingly strong U.S. demand, we have made the difficult decision to postpone the international launch of iPad by one month, until the end of May,” the company said.