Anti-government protesters on Monday put more pressure on Prime Minister Prayut Chan-o-cha by staging a mass rally in front of the German embassy in Bangkok.
The move came after gen Prayut rejected the protesters' deadline demanding he resign by Sunday evening.
The protesters marched to the embassy and submitted a petition. The pro-democracy movement gathered at Samyan intersection about 5pm and started marching on Rama IV Road to the embassy on Sathon Road. The crowd reached the embassy by 7pm and submitted their petition to embassy staff before calling off the rally.
In a letter posted online under its official letterhead, the German embassy said it recognised the protesters' right to gather peacefully and appreciates the Foreign Ministry's protection of the embassy under Article 22 of the Vienna Convention on Diplomatic Relations.
The embassy said it would be ready to receive the petition and convey it to Berlin.
"As in previous instances, the embassy is ready to receive messages addressed to the federal government, conveyed in a peaceful manner," it said.
His Majesty the King travels to Germany from time to time.
In another development, Suvit Thongprasert, formerly known as Luang Pu Buddha Isara, a co-leader of the People's Democratic Reform Committee (PDRC), led a group of ultra-royalists to petition House Speaker Chuan Leekpai against any attempts to set up a House committee on reform of the monarchy.
The PDRC was a group that rallied against the Pheu Thai Party-led administration which was subsequently toppled by the 2014 military coup.
Mr Suvit said the parliament should never accept the protesters' request to have the monarchy reformed because His Majesty the King won't be able to defend himself in parliament against the movement's demands.
He also urged all supporters of the royal institution to come out to protect it, saying they should come to a major gathering planned for Dec 5 to demonstrate their support.
Activities organised by supporters of the monarchy were reported in several parts of the country on Monday.
In Songkhla, Natthachai Likhittrakankun, owner of a sportswear shop in Hat Yai, gave away yellow shirts with screen-printed text reading "United to protect the monarchy" for a third consecutive day.
She has given out more than 1,000 shirts.
A gathering of royalists was also reported yesterday afternoon in Hat Yai.
In Krabi, for instance, more than 4,000 people, led by Muang Krabi mayor Kiratisak Phukaoluan, gathered to show their loyalty to the monarchy.
More than 1,500 yellow-clad supporters also gathered in the northeastern province of Bung Kan to demonstrate their support for the royal institution.