The Home Office is facing further woe over its immigration policies after the advertising watchdog launched a fresh investigation into its controversial "go home" ad vans.

The Advertising Standards Authority (ASA) said it had received 60 complaints about the mobile billboards including concerns the ads were "reminiscent of slogans used by racist groups to attack immigrants in the past".

The ASA probe is in addition to another investigation by the Equality and Human Rights Commission (EHRC) into a wave of immigration spot checks across the UK.

Chris Bryant MP, Labour's shadow immigration minister, said: "This is another embarrassing blow to a Government.

"With more people absconding at the border and fewer illegal immigrants being returned, David Cameron and Theresa May can't even get the basics right, stumbling from one shambles to another."

Ads warning overstaying migrants to "Go home, or you'll be picked up and deported" appeared last month in six London boroughs.

The ASA said some complainants have also questioned whether a claim in the advert reading "106 arrests last week in your area" was misleading.

A spokesman for the Home Office said: "We can confirm we are in contact with the ASA over this investigation and we will respond in due course."

The EHRC launched its probe after it was claimed that the spot checks were being carried out by border officials purely on the basis of ethnicity.