g "historically high" margins since the outbreak of the financial crisis. In the results of the probe published Monday, the regulator said it didn't find any evidence of price fixing or other violations. The high margins were mainly caused by the "high degree of market concentration," as many smaller foreign lenders withdrew from the Dutch market during the financial crisis, it said. The market is currently dominated by four companies: Rabobank Group, ING Bank NV (INGA.AE), ABN Amro Bank NV and SNS Bank NV (SR.AE). These banks jointly have a market share of around 77%, the NMa said. The watchdog said that the market has improved since the start of 2011, and that margins have declined to pre-crisis levels, due to rising competition from foreign players like BNP Paribas SA (BNP.FR) and Bank of Scotland, a unit of Lloyd's Bank "The list of targets just grows and grows." Lockheed Martin Corp. said in a statement Saturday that it detected the May 21 attack "almost immediately" and took countermeasures. "Our systems remain secure; no customer, program or employee personal data has been compromised," the Bethesda, Md.-based company said. Neither Lockheed Martin nor federal agencies would reveal specifics of the attack, or its origins. Company spokeswoman Jennifer Whitlow declined to comment further on the case Sunday. This isn't the first time Lockheed Martin has been targeted. Nearly four years ago, officials revealed that hackers had breached Lockheed's Joint Strike Fighter program. Officials said no classified information about the military program was compromised, but heightened protections were added. Analysts said the latest attack would likely spur rival defense contractors like Northrop Grumman Corp., Raytheon Co., General Dynamics Corp. and Boeing Co. to take additional steps to safeguard their systems. "I guarantee you every major defense contractor is on double alert this weekend, watching what's going on and making sure they're not the next to fall victim," Shaul said. Boeing declined to comment on the company's network security measures. Northrop Grumman spokesman Randy Belote said in an e-mailed statement that "we do not comment on whether or not Northrop Grumman is or has been a target for cyber intrusions," adding that the company "continuously monitors and proactively strengthens the security of our networks." Over the past several years, the U.S. government has become more aggressive in its efforts to tackle cybercrime, developing strategies to beef up government computer systems, expand cooperation with other countries and improve coordination with the private sector. President Barack Obama declared cybersecurity a top priority shortly after taking office in 2009, setting off several government-wide reviews to develop strategies to better secure government, business and public online activity. The Pentagon last May set up a new Cyber Command, based alongside the National Security Agency at Fort Meade, Md., in recognition of the expanding threat against the Defense Department and the need to better coordinate the nation's offensive and defensive cyber operations. The Department of Homeland Security is also slowly employing an automated system — known as Einstein 2 and Einstein 3 — to protect government agencies' computer systems. Still, the attacks have continued. William J. Lynn III, the deputy defense secretary, said in January that more than 100 foreign intelligence agencies have tried to breach U.S. defense computer networks, largely to steal military plans and weapons systems designs. China is often pointed to as a source of cyber attacks because a large amount of malware, or malicious software, originates from there. The government denies it is involved but experts say the high skill level of some attacks suggests the Chinese military, a leader in cyber