The FA has refused to clarify what sanctions Watford could face due to their supporters using pyrotechnics at away games.

The Hornets published a statement on Thursday night issuing what it described as "a last and final plea to their supporters" after the FA threatened the club with sanctions after pyrotechnics, which include devices such as smoke bombs and flares, were used at a few away grounds this season.

A yellow smoke bomb was then subsequently let off at Portman Road during the match with Ipswich Town which, according to a Hertfordshire Constabulary Twitter feed, resulted in one Hornets fan having an asthma attack.

The Watford Observer contacted the FA today to ask what sanctions the Golden Boys could face, following last Thursday's "final plea" from the club.

The FA refused to clarify but a spokeman did say: "The FA reminds all supporters that the use of pyrotechnics within stadia is a criminal offence and subject to banning orders."

He added: "We have written to Watford prior to the most recent occasion and we will be investigating."

The FA did confirm last week's warning was sent directly to Watford and it was not a circular message to all clubs.

We also asked Watford what the FA's possible sanctions were but they have been unavailable to comment.

They were also unable to confirm if Hornets fans have previously been subject to criminal prosecution or given banning orders due to the use of pyrotechnics.

Watford’s statement on Thursday read: "Despite a number of requests to desist, issued here at watfordfc.com and supported via other communication channels, Watford fans once again suffered from the use of pyrotechnics by fellow supporters at Leeds United on Saturday, December 7.

"The club now finds itself in the onerous position of having to issue a last and final plea to its supporters, especially those who frequent away matches, to ask that due notice is heeded of previous warnings."

In a previous statement, the Hornets added: "The use of pyrotechnics has no place in English football and we would urge all supporters to take positive action in assisting to eradicate this unlawful practice."

Research conducted with 1,635 Premier League supporters found 87 per cent of fans believe pyrotechnics are dangerous at matches and that 86 per cent were concerned for their safety. The same number thinks flares and smoke bombs are a fire risk and 79 per cent consider them to be a health hazard.