OTTAWA, Dec 16 (Reuters) - Canada, Sweden, Ukraine and Britain on Thursday said they could consider new steps in line with international law against Iran if it failed to respond by Jan. 5 to demands for reparations after the downing of a passenger airliner last year. Most of the 176 people killed when Iran shot down a Ukrainian jet in January 2020 were citizens from those four countries, which created a coordination group that seeks to hold Tehran to account. "The Coordination Group"s patience is wearing thin," it said in a statement, adding that the group had pressed Tehran to open talks on reparations and to deliver justice but said Iran had shown it was reluctant to respond in a timely manner. It said Iran should respond by Jan 5 or the group would "have to seriously consider other actions to resolve this matter within the framework of international law" but gave no details. Tehran says Revolutionary Guards accidentally shot down the Boeing 737 jet and blamed a misaligned radar and an error by the air defense operator at a time when tensions were high between Tehran and the United States. Last month, families of victims alleged in a report that high-ranking Iranian officials were responsible. In June, Canada said it had found no evidence that the downing of the plane had been premeditated. read more