Wales introduced a two-week series of “fire safety measures”, including a ban on the sale of non-essential goods in stores that may remain open.
More than 500 vehicles were stopped by police in Wales on the first weekend of the firebreak closure.
People from England are not allowed to enter Wales unless the goods are “essential”.
People can only leave their homes for limited reasons, such as to buy food and medicines, provide care or exercise, and they must work from home if possible.
The new restrictions came into force on Friday at 6 p.m. and remain in force until November 9.
Similarly, entry into Wales will be restricted to necessary travel only during the fire season, e.g. travel for work purposes or to return home.
Persons travelling from an Exempt County or Territory, including England, will require a reasonable excuse for entering and staying in Wales and must comply with fire safety regulations.
A statement said: “During the first weekend of the new restrictions, we conducted proactive patrols and engaged more than 500 drivers.
This strict measure appears to have been enforced by Gwent Police, who confirmed that their officers stopped the vehicles as part of “proactive patrols” in communities throughout the Gwent Police District, which includes Newport, Monmouthshire, Blaenau Gwent, Caerphilly and Torfaen.
“We issued a number of penalty notices, including for house parties and large gatherings.
A Gwent police Twitter account also tweeted on Saturday that officers were patrolling on Friday night and imposing stiff penalties, sharing a picture of the Prince of Wales bridge on the border with England, Wales Online reports.
The Gwent police statement also discussed their response to the cordoning off: “We know that this is a very difficult time for everyone and we thank the members of our community for their continued support as we all work together to ensure everyone’s safety.
“We all have a role to play and here at Gwent Police we will continue to do our best to protect and reassure our communities.
The Coronavirus Regulations provide for a fixed fine for most types of offence, with a fine of £60 for a second offence, increased to £120 for a second offence and further doubled for repeated offences, up to a maximum of £1,920.
“From the start of this pandemic, and throughout the duration of this new cordoning off, we will continue to work with our communities and explain the importance of keeping Wales safe. For those who knowingly violate these restrictions, we will take enforcement action….