A video published on a YouTube account affliated with the pro-government forces shows Syrian Army soldiers and allied forces from various militia groups as well as Hezbollah fighters celebrating their victory in Abu Kamal.
The two outlets said earlier that Syrian troops had linked up with Iraqi forces across the border.
Baghdadi took control of what was then known as the Islamic State of Iraq in 2010 after the death of its former leader.
The Iraqi Popular Mobilization Forces (PMF), an alliance of militias, denied a report by the Observatory that it had crossed the Syrian border and was attacking Albu Kamal.
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CEO Hock Tan last week, saying the company is likely to relocate its headquarters from Singapore to the United States. Broadcom said if the deal is approved, it expected a combined company to have revenues of about $51 billion.
"That's indicative of the fact that ISIS is collapsing, not only as a physical caliphate but also in ownership of land", Croft explained, adding: "They only now control about 4 or 5 percent of the original area they covered, so the number of targets has dropped dramatically in the last month".
On Tuesday, Bouthaina Shaaban, a senior adviser to Syrian President Bashar Assad, described the USA forces aiding the SDF in Syria as illegal invaders. In the years since, however, local and global forces have reduced ISIS territory in both countries to a fraction of its former self.
Al-Iraqiya TV said al-Abadi visited the newly-liberated town of Qaim and the nearby Husaybah border crossing in western Iraq. Last month they captured IS's self-styled capital, Raqqa. Iraqi Prime Minister Haider al-Abadi said Tuesday that his country's "next war would be against the corrupt", according to the National Iraqi News Agency.