English Premier League side Newcastle United on Friday said they had completed the signing of Lille and France defender Mathieu Debuchy for an undisclosed fee.

The 27-year-old, who has played more than 230 times for the Ligue 1 side during a 10-year spell, including in their league and cup-winning double year in the 2010-2011 season, has signed a five-and-a-half year contract at St James' Park.

Ten people were injured in the early hours of Sunday when an armed man opened fire at a nightclub in northern France after being refused entry, police said.

The injuries were not serious and the wounded were taken to hospital in nearby Cambrai, according to the armed gendarmerie police.

A gunman shot dead two people at a nightclub in northern France early Sunday in what appeared to be a revenge attack after he was kicked out of the disco, police and local officials said.

The unidentified man, who was "known to police", had been thrown out of the Theatro disco in the heart of Lille but returned about 3 a.m and opened fire with a Kalashnikov-style weapon, a local official said.

An administrative loophole allows passengers on the Eurostar train to enter Britain without any passport checks and London is powerless to stop the practice alone, the BBC reported on Thursday.

British border officials trying to weed out suspected offenders at the Brussels train station have been threatened with arrest by Belgian police, it said citing internal government documents and emails.

Rudi Garcia was in defiant mood as Marseille went top of the table for the first time in five months Wednesday, but the Lille handler knows there is little room for error if they are to stun the French champions to take the title.

"It was always going to be likely they went top, but what counts now is how we react," Garcia said after Marseille claimed a 4-2 win against Nice to push Lille into second by one point.