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Chelsea head coach Antonio Conte is adamant Arsenal are a Premier League title contender.
The Gunners have lost two of their first four matches and the most recent away game prior to their trip to Stamford Bridge was a 4-0 loss at Liverpool, which reignited debate about Arsene Wenger's position as manager.
Arsenal have not won at Chelsea since October 2011 and have won two of 21 games against the established top six since the start of the 2013-14 season, but Conte feels the Gunners are a threat.
"For sure Arsenal is a big rival for the title," he said. "If you see their squad you can understand there are a lot of top players. I don't understand why they can't fight for the title.
"They lost only one player now, (Alex) Oxlade-Chamberlain. They kept all the players from last season. In their squad there are many top players.
"I think Arsenal is one of the six top teams in England.
"For this reason I think it's a massive game for us. It's the same when you play against (Manchester) City, against Liverpool, (Manchester) United, Tottenham.
"In England there are six top teams and when you play against one of them it's always a massive game. We have to fight."
Leyton and Wanstead MP John Cryer said the stabbing of three people at Leytonstone tube station was an "appalling attack" but urged local people to continue as normal.
"It is very frightening for local people. I have been talking to some of the local businesses and obviously they are all very worried about it," he told BBC1's Sunday Politics.
"I think the message is that we carry on as normal, we don't allow this sort of barbaric behaviour to change our lives."
The Labour MP voted against air strikes on Syria, but has warned against linking the stabbing with the decision to start bombing.
Mr Cryer said: "I think it would be dangerous to say this is a direct consequence of air strikes on Syria, however I feel about the air strikes on Syria."
Labour leader Jeremy Corbyn has described the Leytonstone stabbing, that is being investigated by Counter Terrorism Command, as "absolutely shocking".
Amateur video obtained by ITV News shows people trying to get away from Leytonstone station as police confront the alleged attacker. Police say a taser was discharged during the arrest.
Witnesses say that after his arrest, he shouted: "This is for Syria."
ITV News correspondent Duncan Golestani reports:
An eyewitness of the stabbing attack in east London has told ITV News that he shouted "this is for Syria" after the attack.
The incident just after 7pm on Saturday is being treated as a terrorist incident by police.
One man was seriously injured and two sustained minor injuries, police said.
A man has been arrested after reports of a stabbing at Leytonstone station.
A Met Police spokesman said they were called just after 7pm to reports of a stabbing and people being threatened by a man with a knife outside the station.
The police are looking into whether there was more than one injury and how severe the injuries are.
The man was tasered and arrested.
Latest ITV News reports
Counter terrorism police have searched an east London property whilst investigating stabbings at a London tube station.
A man shouted "you ain't no Muslim, bruv!" in defiance of the Leytonstone knife attacker who claimed the attacks "for Syria".