When Kiddell, posing as Mr Russell, turned up for an appointment he was arrested by plain clothes police.
Fatah-linked Palestinian security officers in plain clothes manned the barricades and lit tyres.
An undisclosed number of plain clothes police officers are travelling to Germany to help identify offenders who slip through the net.
Metal detectors will be positioned at the end of the gangplank, while sniffer dogs and uniformed and plain clothes policemen will stand guard.
Miners say plain clothes police have infiltrated picket lines and officers have also been turning away pickets thought likely to cause a breach of the peace.
"It has already started, " he said, citing reports that members of the security forces have gone home after their shifts ended and changed into plain clothes to join the protesters.
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The protest might have petered out had not snipers in plain clothes, assumed to be security men loyal to Mr Saleh, fired into crowds in the capital on March 18th, killing some 50 people.
The Superintendents' Association, which represents senior officers below the rank of chief constable, argues that officers could patrol alone, rather than in pairs, and detectives could work in uniform, rather than in plain clothes.
Palestinian police in the designated area patrol in plain clothes and unarmed, but are not allowed to use force to restrain the settlers if they seek to impose themselves on the Palestinian villagers either by attacking them or by damaging their property.
Allow councils to use plain-clothes inspectors to detect parking-badge fraud and to recover badges that have been cancelled.
Mr Cao says that since late July plain-clothes police have followed him everywhere and, he suspects, tapped his phones.
One group recently attacked several stallholders at an open-air market in Rafina, a port near Athens, after posing as plain-clothes police checking their permits.
"In recent days several correspondents have encountered groups of violent, plain-clothes thugs" who were "operating in groups of more than a dozen, " the warning continued.
The BBC's Owen Bennett-Jones says the trouble began when one of Mr Sharif's co-accused claimed that there were plain-clothes intelligence officers in the courtroom on Wednesday.
She had no time for semantics: whether to include deaths outside the city walls, whether the plain-clothes soldiers had been billeted with civilians, and so on.
On February 4th Mr Diallo, a young Guinean with no criminal record, was challenged outside his apartment building by four plain-clothes police officers, looking for a rape suspect.
Instead I was arrested by two plain-clothes policemen, and taken into custody, where my madness saw me strip naked and draw messages on the walls of my barren Hamilton cell.
Azeris in Moscow say that one compatriot, a street vendor, was beaten to death this month by plain-clothes police after a row over a Russian who urinated on his kiosk.
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Mr Saravanapavan said that on Tuesday night, the editor of his Jaffna paper was beaten by plain-clothes soldiers while trying to cover the unrest and had to be admitted to hospital.
Plain-clothes police lurk everywhere in Lhasa and the towns.
Elsewhere, in Palpa in the south-west, three teenagers following a tradition of raising money for a Hindu festival on March 24th were shot dead when they approached a car carrying plain-clothes soldiers.
On the contrary, the government's tactics, along with Mr Khamenei's silence and the increasingly ungloved intervention of the Revolutionary Guards, the elite military corps that commands the plain-clothes baseej militia used for crowd control, may reflect a growing sense of desperation.
Plain-clothes agents of the Committee for the Promotion of Virtue and Prevention of Vice, as the religious police are known, patrol streets, parks and shopping centres, intervening to scold offenders, strike them with switches or haul them off to be disciplined by ordinary police.
Han has several staff cutting clothes in a back room in plain sight of guests.
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