By KATRIN BENNHOLD and MARK LANDLER
The New York Times

KARLSRUHE , Germany , Sept. 6 - German investigators were searching today for 10 suspects in connection with a foiled terrorist attack on German and American targets by Islamic militants, officials said.

Joerg Ziercke, the head of Germany’s Federal Crime Office, left, and German federal prosecutor Monika Harms at press conference in Karlsruhe Wednesday with hydrogen peroxide seized from the suspects.

The suspects are believed to have provided support to the three main suspects in the plot, according to August Hanning, the deputy interior minister and a former head of Germany’s foreign intelligence service, the B.N.D. Their arrests were announced Wednesday, a day after they were captured in a raid in western Germany.

While some of the suspect still at large are believed to still be in Germany, Mr. Hanning said the arrests Tuesday had ended the security threat.

“There is no danger coming from this concrete cell,” he told German television station ARD on Thursday. But he also warned that Germany remained a target for Islamic terrorists and in that sense the risk remained high.

Security services were “concerned” about what he described as “the order to undertake attacks in Germany,” Mr. Hanning said.

Tuesday’s raid brought to an end months of undercover surveillance operation during which German agents had monitored the suspects closely. Authorities seized large quantities of hydrogen peroxide, which can be mixed with other chemicals to make explosives, and military-grade detonators. The three men arrested were two German citizens who had converted to Islam and a Turkish resident of Germany. The police and security officials said they attacks they were planning could have been deadlier than those that killed dozens in London and Madrid.

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