"We did seek further information from Israel on this question," Blinken said at a joint briefing with Iceland's foreign minister in Reykjavik.
"It's my understanding that we've received some further information through intelligence channels, and it's not something I can comment on," he said.
A call from by US President Joe Biden on Monday in support of a ceasefire appeared to go unheeded, even as cross-border fighting between Israel and Hamas appeared to abate slightly on Tuesday.