As the English Football Association investigates the unrest, the Premier League separately said it would be contacting West Ham to seek assurances that the disorder would not be repeated at future matches.
"I don't know all the politics at West Ham, I've not been here long enough", Moyes said.
"It is essential that everybody who plays or attends a Premier League football match can do so safely", a Premier League statement read. But you can't cross the line and come on the pitch.
West Ham United have immediately launched a full and thorough investigation into the incidents which marred the second half of today's match and are committed to taking decisive and appropriate action.More news: Britain First leaders jailed over Ramsgate rape trial videos and leaflets
A week that had already seen a planned protest march by fans against the club's board called off as West Ham supporters' groups fell out with each other descended into chaos at the London Stadium, with stewards failing to intervene on several occasions.
While the Clarets have had a year to forget so far, they picked up their first win of 2018 last weekend, coming from behind to clinch victory for the first time this season.
West Ham United manager David Moyes has told fans in his London Evening Standard column that he did not want to sell Andre Ayew to Swansea City in January, but the attacker had made it clear he wanted to leave. By that stage the action on the pitch had become nearly incidental with fans directing their anger at the club's chiefs. I wouldn't use that as an excuse for me after it, but I certainly don't think it helped.
"What we need is the club, supporters, players, everyone, is to pull together", West Ham manager David Moyes said. We are one of about seven or eight teams, or perhaps even more, with only three to six points between them, which shows how hard the Premier League is. I don't think the players felt like that.More news: Freezer malfunction leaves more than 2000 frozen eggs and embryos at risk
"It's a tough situation, I can sympathise with the fans".
Butland has yet to play a minute at a major tournament, although Stoke boss Paul Lambert has labelled him the "best goalkeeper in Britain".
"We scored a top goal, a great pass from Matt Lowton and a fine lay-off [by Wood]".More news: Download Android P Launcher - Brings Focus Back to the Dock!
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