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. Last Updated: 07/27/2016

Police on High Alert After Blast

Police in Moscow, the surrounding Moscow region and the Far East were put on high alert Thursday following a train bombing earlier this week that injured 27 people.

Senior police officials will be in their offices around the clock, more police officers will be on the streets, and police will keep a sharp eye on apartments for suspicious activities, Moscow police spokesman Yevgeny Gildeyev said.

The heightened security measures will remain in place indefinitely, he said on Ekho Moskvy radio.

Gildeyev said the alert was prompted by Monday's bombing of a train en route from Moscow to St. Petersburg.

He did not explain why police in the Far East also had been placed on alert. Police in St. Petersburg and the Novgorod region, where the explosion occurred, were not put on alert.

Meanwhile, Komsomolskaya Pravda published a composite sketch of the suspected bomber, which it said it received from investigators. The description of the man, who has Slav features, was obtained from residents of nearby villages who had seen him loitering around the site of the blast, the report said.

Investigators have said ultranationalists are the primary suspects .

Dismissing the suggestion that Chechen rebels might be behind the attack, Chechen President Ramzan Kadyrov said late Wednesday that no insurgent groups capable of carrying out attacks such as Monday's bombing remained in Chechnya.